弹出窗口函数
function openwindow(url,name,iWidth,iHeight){
var url; //转向网页的地址;
var name; //网页名称，可为空;
var iWidth; //弹出窗口的宽度;
var iHeight; //弹出窗口的高度;
//window.screen.height获得屏幕的高，window.screen.width获得屏幕的宽
var iTop = (window.screen.height-30-iHeight)/2; //获得窗口的垂直位置;
var iLeft = (window.screen.width-10-iWidth)/2; //获得窗口的水平位置;
window.open(url,name,'height='+iHeight+',,innerHeight='+iHeight+',width='+iWidth+',innerWidth='+iWidth+',top='+iTop+',left='+iLeft+',toolbar=no,menubar=no,scrollbars=auto,resizeable=no,location=no,status=no');
}
openwindow("url","title ", "400","300");