var width = 300; 
var height = 250;
var left = 380;
var top = 350;
 
URL = "popup.swf";
 
window.open(URL,'popup', 'width='+width+', height='+height+', top='+top+', left='+left+', scrollbars=no, status=no, toolbar=no, location=no, directories=no, menubar=no, resizable=no, fullscreen=no');