var win= null;

function popup(url,name,width,height){
	var winl = (screen.width-width)/2;
	var wint = (screen.height-height)/2;
	var settings ='height='+height+',';
	settings +='width='+width+',';
	settings +='top='+wint+',';
	settings +='left='+winl+',';
	settings +='scrollbars=yes,';
	settings +='resizable=yes';
	win=window.open(url,name,settings);
	if(parseInt(navigator.appVersion) >= 4){win.window.focus();}
}