IE7上的弹出窗口未打开

嗨,javascript专家,我有一个javascript代码,它在firefox上工作得很好,但在ie 7上却不工作。你知道为什么吗?

这是密码

function TestWindow()
{
     SimpleWindow('Default.aspx', 'Simple Test', 200, 200, 'yes')
}

function SimpleWindow(mypage,myname,w,h,scroll)
{

    var win= null;

    var winl = (screen.width-w)/2;


    var wint = (screen.height-h)/2;

    settings='height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',toolbar=no,location=no,status=no,menubar=no,resizable=no,dependent=no'

    win=window.open(mypage,myname,settings)

    if(parseInt(navigator.appVersion) >= 4)
        {
            win.window.focus();
        }
    }