function popwin(url,name,width,height){
//popwin('','',300,500)
//popwin('','') width 640 and height=480

	if(width=='')
		width='640';
	if(height=='')
		height='480'
	var features='width='+width+',height='+height+',scrollbars=1'+',resizable=1';
	window.open(url,name,features);
}