diff --git a/YACOSWeb/WebContent/WEB-INF/decorators/main.jsp b/YACOSWeb/WebContent/WEB-INF/decorators/main.jsp
index 2ec73dd..0c531db 100644
--- a/YACOSWeb/WebContent/WEB-INF/decorators/main.jsp
+++ b/YACOSWeb/WebContent/WEB-INF/decorators/main.jsp
@@ -12,6 +12,22 @@
 		<title><fmt:message key="title" /></title>
 		<link rel="stylesheet" href="./stylesheets/base.css" type="text/css" />
 		<script type='text/javascript' src='./javascripts/rounded_boxes.js'></script>
+			<script type="text/javascript">
+
+var LoginManager = Class.create({
+	initialize: function(inputField, inputField2){
+		$(inputField).observe("keypress", this.KeyPressHandler.bindAsEventListener(this));
+		$(inputField2).observe("keypress", this.KeyPressHandler.bindAsEventListener(this));
+	},
+	KeyPressHandler: function(event){
+		switch(event.keyCode){
+			case Event.KEY_RETURN:
+				$('mainformlogin').submit();
+		}
+	}
+});
+
+</script>
 		<decorator:head />
 	</head>
 	
diff --git a/YACOSWeb/WebContent/WEB-INF/jsp/addConference2.jsp b/YACOSWeb/WebContent/WEB-INF/jsp/addConference2.jsp
index 6c694e5..bc2656c 100644
--- a/YACOSWeb/WebContent/WEB-INF/jsp/addConference2.jsp
+++ b/YACOSWeb/WebContent/WEB-INF/jsp/addConference2.jsp
@@ -30,25 +30,25 @@
 				<td class="formLabel"><fmt:message key="conference2.article" />
 				</td>
 				<td><form:input onclick="ds_sh(this);" path="dateArticle"
-					cssStyle="cursor: text" /> <form:errors path="dateArticle" /></td>
+					cssStyle="cursor: text" /> <div class="formError"><form:errors path="dateArticle" /></div></td>
 			</tr>
 			<tr>
 				<td class="formLabel"><fmt:message key="conference2.evaluation" />
 				</td>
 				<td><form:input onclick="ds_sh(this);" path="dateEvaluation"
-					cssStyle="cursor: text" /> <form:errors path="dateEvaluation" />
+					cssStyle="cursor: text" /> <div class="formError"><form:errors path="dateEvaluation" /></div>
 				</td>
 			</tr>
 			<tr>
 				<td class="formLabel"><fmt:message key="conference2.start" />
 				</td>
 				<td><form:input onclick="ds_sh(this);" path="dateStart"
-					cssStyle="cursor: text" /> <form:errors path="dateStart" /></td>
+					cssStyle="cursor: text" /> <div class="formError"><form:errors path="dateStart" /></div></td>
 			</tr>
 			<tr>
 				<td class="formLabel"><fmt:message key="conference2.end" /></td>
 				<td><form:input onclick="ds_sh(this);" path="dateEnd"
-					cssStyle="cursor: text" /> <form:errors path="dateEnd" /></td>
+					cssStyle="cursor: text" /> <div class="formError"><form:errors path="dateEnd" /></div></td>
 			</tr>
 		</tbody>
 		<tfoot>
diff --git a/YACOSWeb/WebContent/WEB-INF/jsp/addConference3.jsp b/YACOSWeb/WebContent/WEB-INF/jsp/addConference3.jsp
index d3ec4d7..7ea40c2 100644
--- a/YACOSWeb/WebContent/WEB-INF/jsp/addConference3.jsp
+++ b/YACOSWeb/WebContent/WEB-INF/jsp/addConference3.jsp
@@ -1,7 +1,25 @@
 <%@ include file="/WEB-INF/decorators/include.jsp"%>
 
 <html>
-<head></head>
+<head>
+
+<script type='text/javascript' src='./javascripts/prototype.js'></script>
+
+<script type='text/javascript'>
+
+function verifNumber() {
+	var re = /^\d+$/;
+
+ 	if(!re.test($('pageNumber').value)) 
+ 		$('errorNumber').style.display = "";
+ 	else
+		$('errorNumber').style.display = "none";
+}
+
+</script>
+
+</head>
+
 <body>
 
 
@@ -21,8 +39,6 @@
 <p class="formHelp"><fmt:message key="conference.help.step3" /></p>
 
 <form:form commandName="formConference" name="monForm">
-	<div class="formErrors"><form:errors path="*" /></div>
-
 	<table>
 		<thead>
 			<tr>
@@ -32,7 +48,7 @@
 		<tbody>
 			<tr>
 				<td class="formLabel">Page's numbers</td>
-				<td><form:input path="pageNumber" /></td>
+				<td><form:input id="pageNumber" path="pageNumber" onchange="verifNumber();"/><div class="formError"><span id="errorNumber" style="display: none;">It should be a number</span></div></td>
 			</tr>
 			<tr>
 				<td class="formLabel">Authorized file types</td>
@@ -60,7 +76,11 @@
 			</tr>
 		</tfoot>
 	</table>
-</form:form>
+</form:form>
+
+<script type="text/javascript">
+	verifNumber();
+</script>
 
 <a href="<c:url value="main.htm"/>">Home</a>
 
diff --git a/YACOSWeb/WebContent/WEB-INF/jsp/addConference4.jsp b/YACOSWeb/WebContent/WEB-INF/jsp/addConference4.jsp
index 95b501c..b0d9ec2 100644
--- a/YACOSWeb/WebContent/WEB-INF/jsp/addConference4.jsp
+++ b/YACOSWeb/WebContent/WEB-INF/jsp/addConference4.jsp
@@ -104,11 +104,27 @@ function addClicked(eleid) {
 
 function writePerson() {
   var person = { id:viewed, label:null, min:null, max:null };
-  dwr.util.getValues(person);
+  dwr.util.getValues(person);
+  
+	var re = /^\d+$/;
+	if(!re.test(person.min)) {
+		dwr.util.setValues({errorMin:"It should be a number"});
+		$('errorMin').style.display = "";
+		return false;
+	}
+	else
+		$('errorMin').style.display = "none";
+		
+	if(!re.test(person.max)) {
+		dwr.util.setValues({errorMax:"It should be a number"});
+		$('errorMax').style.display = "";
+		return false;
+	}
+	else
+		$('errorMax').style.display = "none";
   
   if (person.max <= person.min) {
-  	dwr.util.setValues({id:person.id, label:person.label, min:null, max:null });
-  	dwr.util.setValues({errorMax:"The max value should'nt be superior to the min value"});
+  	dwr.util.setValues({errorMax:"The min value shouldn't be superior to the max value"});
   	$('errorMax').style.display = "";
   }
   else { 
@@ -160,8 +176,6 @@ var CritereManager = Class.create({
 	<fmt:param value="4" />
 	<fmt:param value="5" />
 </fmt:message>
-<br />
-<br />
 
 <p class="formHelp"><fmt:message key="conference.help.step4" /></p>
 <form:form commandName="formConference" name="monForm">
@@ -201,12 +215,13 @@ var CritereManager = Class.create({
 					</tr>
 					<tr>
 						<td>Min:</td>
-						<td><input id="min" type="text" /></td>
+						<td><input id="min" type="text" /></td>
+						<td><div class="formError"><span id="errorMin" style="display: none;"></span></div></td>
 					</tr>
 					<tr>
 						<td>Max:</td>
 						<td><input id="max" type="text" /></td>
-						<td><span id="errorMax"></span></td>
+						<td><div class="formError"><span id="errorMax" style="display: none;"></span></div></td>
 					</tr>
 					<tr>
 						<td colspan="2" align="right"><span id="id"
@@ -216,10 +231,7 @@ var CritereManager = Class.create({
 						<td></td>
 					</tr>
 				</table>
-
-				<script type="text/javascript">
-    	new CritereManager('label', 'min', 'max');
-	</script></td>
+				<script type="text/javascript">	new CritereManager('label', 'min', 'max');</script></td>
 			</tr>
 			<tr>
 				<td class="formLabel">Criteria list for this conference</td>
diff --git a/YACOSWeb/WebContent/WEB-INF/jsp/addConference5.jsp b/YACOSWeb/WebContent/WEB-INF/jsp/addConference5.jsp
index 1f2864b..e908be0 100644
--- a/YACOSWeb/WebContent/WEB-INF/jsp/addConference5.jsp
+++ b/YACOSWeb/WebContent/WEB-INF/jsp/addConference5.jsp
@@ -132,7 +132,7 @@ function filterUser(el, value) {
 			<tr>
 				<td class="formLabel"><fmt:message key="conference5.findUsers" />
 				</td>
-				<td>Filter <form:input id="myfilter" path="myfilter" /> <br />
+				<td><form:input id="myfilter" path="myfilter" /> <br />
 				<br />
 				<table border="1" id="tableName" style="display: none;">
 					<thead>
@@ -154,7 +154,7 @@ function filterUser(el, value) {
 			<tr>
 				<td class="formLabel"><fmt:message key="conference5.usersList" />
 				</td>
-				<td>
+				<td><br />
 				<table border="1" id="tableNameAdded" style="display: none;">
 					<thead>
 						<tr>
@@ -175,7 +175,7 @@ function filterUser(el, value) {
 			<tr>
 				<td class="formLabel"><fmt:message
 					key="conference5.invitation.send" /></td>
-				<td>eMail: <input id="emailAddress" type="text" /> <input
+				<td><input id="emailAddress" type="text" /> <input
 					type="button" name="inviteButton" id="inviteButton" value="Invite" />
 				</td>
 			</tr>
diff --git a/YACOSWeb/WebContent/WEB-INF/jsp/loginFull.jsp b/YACOSWeb/WebContent/WEB-INF/jsp/loginFull.jsp
index a4cf1f8..94bc514 100644
--- a/YACOSWeb/WebContent/WEB-INF/jsp/loginFull.jsp
+++ b/YACOSWeb/WebContent/WEB-INF/jsp/loginFull.jsp
@@ -23,13 +23,14 @@
 	</td><td>
 	<div class="cbb">
 		<h2><fmt:message key="login.label.alreadyaccount" /> :</h2>
-	<form action="<c:url value='j_acegi_security_check'/>" method="POST" id="formlogin">
-		<fmt:message key="login.label.login" /> : <input type='text' name='j_username' /><br />
-		<fmt:message key="login.label.password" /> : <input type='password' name='j_password' /><br />
+	<form action="<c:url value='j_acegi_security_check'/>" method="POST" id="mainformlogin">
+		<fmt:message key="login.label.login" /> : <input id="username" type='text' name='j_username' /><br />
+		<fmt:message key="login.label.password" /> : <input id="password" type='password' name='j_password' /><br />
 		<input type="checkbox" name="_acegi_security_remember_me"/>&nbsp;&nbsp;<fmt:message key='login.label.rememberme' /><br />
 
 		<br /><br />
-		<a href="javascript:document.getElementById('formlogin').submit();" id="submit_btn"><fmt:message key="login.btn.connexion" /></a>
+		<a href="javascript:document.getElementById('mainformlogin').submit();" id="submit_btn"><fmt:message key="login.btn.connexion" /></a>
+		<script type="text/javascript">	new LoginManager('username', 'password');</script>
 	</form>
 	<div class="yacos_button">
 		<a href="<c:url value="/forgotPassword.htm"/>">
@@ -39,5 +40,6 @@
 	</div>
 	</td></tr>
 	</table>
+	
 </body>
 </html>
\ No newline at end of file
diff --git a/YACOSWeb/WebContent/login.jsp b/YACOSWeb/WebContent/login.jsp
index 32687ea..2bed51d 100644
--- a/YACOSWeb/WebContent/login.jsp
+++ b/YACOSWeb/WebContent/login.jsp
@@ -1,18 +1,19 @@
 <%@ include file="/WEB-INF/decorators/include.jsp"%>
 
 <html>
-<head></head>
+<head>
+</head>
 <body>
 	<form action="<c:url value='j_acegi_security_check'/>" method="POST" id="mainformlogin">
 		<fmt:message key="login.txt.login"/> :
-		<input type='text' name='j_username' value="<fmt:message key='login.field.login' />" onfocus="if (this.value == '<fmt:message key='login.field.login' />') { this.value = ''; }" onblur="if (this.value == '') { this.value = '<fmt:message key='login.field.login' />'; }" />
-		<input type='password' name='j_password' />
+		<input id="username" type='text' name='j_username' value="<fmt:message key='login.field.login' />" onfocus="if (this.value == '<fmt:message key='login.field.login' />') { this.value = ''; }" onblur="if (this.value == '') { this.value = '<fmt:message key='login.field.login' />'; }" />
+		<input id="password" type='password' name='j_password' />
 		<a href="javascript:document.getElementById('mainformlogin').submit();" id="submit_btn"><fmt:message key="login.btn.connexion" /></a>
 		<br />
 		<a href="login.htm" id="connexion"><fmt:message key="login.label.register"/></a>
 		&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 		<fmt:message key='login.label.rememberme' />&nbsp;&nbsp;<input type="checkbox" name="_acegi_security_remember_me"/>
+		<script type="text/javascript">	new LoginManager('username', 'password');</script>
 	</form>
-
 </body>
 </html>
\ No newline at end of file
