function popup(data,width,height,scrollbars){
	if(!width){
		width=640;
	}
	if(!height){
		height=480;
	}
	if(!scrollbars){
		scrollbars=0;
	}
	window.open(data,'','toolbar=0,status=0,location=0,directories=0,menubar=0,scrollbars='+scrollbars+',resizable=0,width='+width+',height='+height+',left=0,top=0');
}