function openWin (page2Show, width, height)
 {
    var avaliableHeight;
    var avaliableWidth;
    var scrnTop;
    var scrnLeft;
    
    avaliableHeight = window.screen.height;
    avaliableWidth = window.screen.width;

    scrnTop = (parseInt(avaliableHeight)/2) - (parseInt(height)/2);
    scrnLeft = (parseInt(avaliableWidth)/2) - (parseInt(width)/2);  
    
    if (width == "max" || height == "max")
    {
        scrnTop = parseInt(5); 
        scrnLeft = parseInt(0);
    }
    else
    {
        scrnTop = parseInt(scrnTop); 
        scrnLeft = parseInt(scrnLeft);
    }
    
    if (width == "max")
    {
        width = window.screen.width;     
    }
    
    if (height == "max")
    {
        height = window.screen.height;
    }
	
    aNewWindow = window.open(page2Show, "sub", "status,scrollbars,resizable,height=" + height + ",width=" + width + ", left=" + scrnLeft + ", top=" + scrnTop);
}