function openPopupWindow( pageToLoad, winName, width, height, center) 
{
    xposition=0; yposition=0;
    if ((parseInt(navigator.appVersion) >= 4 ) && (center)){
        xposition = (screen.width - width) / 2;
        yposition = (screen.height - height) / 2;
    }
    args = "width=" + width + "," + "height=" + height + "," 
	+ "location=0,"   + "menubar=0," + "resizable=1," 
	+ "scrollbars=1," + "status=0,"  + "titlebar=0,"   
	+ "toolbar=0,"   + "hotkeys=0,"
    + "screenx=" + xposition + ","  //NN Only
    + "screeny=" + yposition + ","  //NN Only
    + "left=" + xposition + ","     //IE Only
    + "top=" + yposition;           //IE Only
	win = open( pageToLoad,winName,args );
}