function open_center(url, name, params, Wwidth, Wheight) {	
	var Swidth 	= 0;
	var Sheight = 0;
	var Wleft 	= 0;
	var Wtop 	= 0;
	if(window.navigator.appName.toString().indexOf('Micro') == 0)	{
		Swidth = screen.Width;
		Sheight = screen.Height;
		Wleft = (parseInt(Swidth) / 2) - (Wwidth / 2);
		Wtop = (parseInt(Sheight) / 2) - (Wheight / 2);
	} else {
		Swidth = window.innerWidth;
		Sheight = window.innerHeight;
		Wleft = (parseInt(Swidth) / 2) - (Wwidth / 2);
		Wtop = (parseInt(Sheight) / 2) - (Wheight / 2) + 80;
	}
	var params = params+",left="+Wleft+",top="+ Wtop+",width="+Wwidth+",height="+Wheight;
	var popup = window.open(url, name, params);
	if(!window.focus())
	{
		popup.focus();
	}
}