var myPopupWindow = '';  
function openPopupWindow(url, name, width, height)  
{  
    //Remove special characters from name  
    name = name.replace(/\/|\-|\./gi, "");  
  
    //Remove whitespaces from name  
    var whitespace = new RegExp("\\s","g");  
    name = name.replace(whitespace,"");  
  
    //If it is already open  
    if (!myPopupWindow.closed && myPopupWindow.location)  
    {  
        myPopupWindow.location.href = encodeUrl(url);  
    }  
    else  
    {  
        myPopupWindow= window.open(encodeUrl(url),name, "location=no, scrollbars=yes, resizable=yes, toolbar=no, menubar=no, width=" + width + ", height=" + height );  
        if (!myPopupWindow.opener) myPopupWindow.opener = self;  
    }  
  
     //If my main window has focus - set it to the popup  
    if (window.focus) {myPopupWindow.focus()}  
}
function encodeUrl(url)  
{  
    if (url.indexOf("?")>0)  
    {  
        encodedParams = "?";  
        parts = url.split("?");  
        params = parts[1].split("&");  
        for(i = 0; i < params.length; i++)  
        {  
            if (i > 0)  
            {  
                encodedParams += "&";  
            }  
            if (params[i].indexOf("=")>0) //Avoid null values  
            {  
                p = params[i].split("=");  
                encodedParams += (p[0] + "=" + escape(encodeURI(p[1])));  
            }  
            else  
            {  
                encodedParams += params[i];  
            }  
        }  
        url = parts[0] + encodedParams;  
    }  
    return url;  
}