function popupwindow(argURL,width,height,scrollbar,resize) {

	var screenw = screen.availWidth;
	var screenh = screen.availHeight;

	var leftPos = (screenw-width)/2; 
	var topPos = (screenh-height)/2;

	displaypopup = window.open(argURL,'Display','resizable='+resize+',scrollbars='+scrollbar+',width='+width+',height='+height+',left='+leftPos+',top='+topPos+',toolbar=no');
	displaypopup.focus();
}