Popup to avoid losing unsaved data

Hi,
I'm developing a BSP where the user will modify data and I'd like a popup to appear when the 'Back' button is pressed and there have been usaved modifications.
Basically it should be a popup with a 'You have modified the data. Are you sure you want to leave the page without saving?' or something like that and two buttons YES/NO (the yes button should execute an event and the no just close the popup).
Can you help me with it?
Many thanks in advance
Carles

Hi,
Are you talking about the Browser back button ?
If yes, then i have a solution for Internet Explorer...
Try this :
<html>
<script language = "javascript">
window.onbeforeunload = bunload;
function bunload(){
mess = "You will lose all information providednduring navigation of this site";
return mess;
function confirmEvent()
     alert("Function called");
     if(!confirm('Do you really want to proceed?'))
          window.onbeforeunload = false
          return false;
function test()
alert("Hellio");
document.frm.t1[2].style.background = "rgb(231,220,24)";
var arr = document.frm.elements;
var i;
for(i=0;i<arr.length;i++)
     if(arr<i>.type == "text")
          if(!arr<i>.disabled)
               alert(arr<i>.value);
alert(document.frm.t1[3].value);
</script>
<body>
<form name="frm">
<input type="text" name="t1" size=5 value="Hello1" disabled="true">
<input type="text" name="t1" size=5 value="Hello2" style="font-family: Verdana;font-size: 10; align=middle; height: 17px;border: solid rgb(220,225,260) 1px">
<input type="text" name="t1" size=5 value="Hello3">
<input type="button" name="b1" value="Click here" onClick="test()">
</form>
</body>
</html>

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