AJAX Javascript ModalDialogBox IE 7 and above not supporting

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IE7

Javascript

IE

Ajax

dialog

I am trying to achive a ause functionality in javascript.

I am making an asynchronous AJAX call and trying to achive synhronous functionality of AJAX. I want to pause the javascript until i receive the AJAX response for the asyn call of AJAX. Due to some reason i am not using the AJAX synchronous call which will solve my problem.

Once i make a call i use the following two functions to pause the JS

function pause2(numberMillis) {
var dialogScript = "window.setTimeout(" +
" function () { document.write(' '); window.close(); }, "
+ numberMillis + ");";
var result = window.showModalDialog('javascript.document.writeln(' +
'"<script>' + dialogScript + '<' + '/script>")');
}

function pause3()
{

do
{
if(lmsCommitTimeOut<9000){
lmsCommitTimeOut=lmsCommitTimeOut+1000;
pause2(1000);
}
else
{
//alert("TimeOut");
lmsCommitStatus="false";
return;
}

}while(readStateAchived=="false")

}

I call the pause3(); function which internally calls the pause2(1000) for every 1sec until i get the ajax response back, which i check with the help of a js variable "readStateAchived".

This is working well in IE6, but in IE7 it is poping up the modal window and not getting closed, I have to close it manually.

Can anyone help me with this?

Thank you.