function popWindow(theURL,windowName){	
		  width = 550;
		  height = 550;
         startLeftPos = screen.width;
         startTopPos = screen.height;
         leftPos = (startLeftPos-width)/2;
		  topPos = (startTopPos-height)/2;
		  window.open(theURL,windowName,'width='+width+',height='+height+',resizable=0,scrollbars=yes,left='+leftPos+',top='+topPos);
}