function getHeight() {

     return self.innerHeight ||
             jQuery.boxModel && document.documentElement.clientHeight ||
             document.body.clientHeight;

}

function showImage(num,w,h,type) {
	
	var ih = getHeight()-60;
	if (ih < h) {
	    var diff = (ih/h);
	    w = Math.round(w * diff);
	    h = ih;
	    
	    //alert("shrinking due ot small window: "+w+"x"+h);
	}
	tb_show(null,"viewer.php?id="+num+"&width="+w+"&height="+h+"&type="+type,false);
}