function openWin(name,iWidth,iHeight,url){
	//iWidth 弹出窗口的宽度;
	//iHeight 弹出窗口的高度;
   	//获得窗口的垂直位置
    var iTop = (window.screen.availHeight-30-iHeight)/2;
	//获得窗口的水平位置
	var iLeft = (window.screen.availWidth-10-iWidth)/2;
	var params='width='+iWidth+',height='+iHeight+',top='+iTop+',left='+iLeft+',channelmode=no'+',directories=yes'
		 +',location=no'+',menubar=no'+',resizable=no'+',scrollbars=yes'+',status=yes'+',titlebar=yes'+',toolbar=no';
	return window.open(url,name,params); 
}