function showadvert()
{
    
    var obj = document.getElementById('advertcontroller')
    var objw = document.getElementById('advertwidth')
    var objh = document.getElementById('advertheight')

    if (obj.value != -1)
    {
    var templatenumber = 0;
    var randomnumber=Math.floor(Math.random()*5);
   
    if (obj.value == 0)
        {
        templatenumber = randomnumber + 1;
        }
    else
        {
        templatenumber = obj.value;
        }
    $.fn.colorbox({href:"colorbox/template/advert-" + templatenumber + ".htm", open: true, iframe: true, width: objw.value , height: objh.value}); 
    }
}