function changeImages(id, img_src) 
{   
    var img = document.getElementById(id);
    img.src = img_src;
}
 

function popupWindow(url, width, height)
{ 
    if(width == null)
		width=1000;
	if(height == null)
		height = 800;
    window.open(url,"popupWindow","scrollbars=yes,status=yes,resizable=yes,width=" + width + ",height=" + height);
}