var myPopupWindow = ''; 

function PopWin(url,name,width,height,args)
{
    //url = "http://www.akadesign.com.au/Default.aspx";

    if (!args)
    {
        args="location=no, scrollbars=no, resizable=no, toolbar=no, menubar=no";
    }
    //If it is already open   
    if (!myPopupWindow.closed && myPopupWindow.location)   
    {   
        myPopupWindow.location.href = encodeUrl(url);   
    }   
    else  
    {   
        sleft = (screen.width-width)/2;
        stop = (screen.height-height)/2;
        myPopupWindow = window.open(url, name, args +", width=" + width + ", height=" + height + ", left=" + sleft + ", top= " + stop  );   
        if (!myPopupWindow.opener) myPopupWindow.opener = self;   
    }  
    if (window.focus) {myPopupWindow.focus()}
}

function ViewImage(imageUrl)
{
    window.open(imageUrl,'ImageViewer','toolbar=0,location=0,menubar=0');
}