function lightbox(content,width,height,url){

		document.getElementById('fade').style.display='block'; 
		document.getElementById('lightshow').style.display='block';
		
		if (width)
			document.getElementById('lightshow').style.width=width+"px";
		if (height)
			document.getElementById('lightshow').style.height=height+"px";		
			
		document.getElementById('lightshow').style.marginTop=-(height/2)+"px";
		document.getElementById('lightshow').style.marginLeft=-(width/2)+"px";		

		if(url){
			content='<iframe src="'+url+'" width="'+width+'" height="'+height+'" frameborder="0" scrolling="auto"></iframe>';
		}

		document.getElementById('lightshow').innerHTML=content;
	}