Pop Up Problem

In my flash movie I have a button - no instance name, the button in named LtButtonClick

I select this button and add the following as to it

ActionScript Code:
on (release) {    getURL("javascript:launchMyWindow();");}


I have the html page that this flash file resides in, in the head of the code right after the meta info, i have this javascript:

<script language="JavaScript" type="text/JavaScript">
<!--
function launchMyWindow() {
window.open(PrioritySchedulingV2.php','','toolbar= no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, width=350, height=455, left=50, top=50');
}
//-->
</script>

Nothing happens when you click the button - where is my popup window?