function __j_is_browser(br)
{
	return(navigator.userAgent.toLowerCase().indexOf(br)+1);
}

function do_zoom(ename,_in)
{
	if(!__j_is_browser("msie"))
	{
		alert("El Zoom solo funciona en IE.");
		return;
	}
	var obj=document.getElementById(ename);var m=_in?1.1:0.9;obj.width*=m;obj.height*=m;
}

function zoom(nomobj , valor )
{
	var agr = document.getElementById('amp');
	var ach = document.getElementById('ach');
	//do_zoom(ename1 , valor);
	if(valor) // agranda
	{
		do_zoom(nomobj , true);
		ach.style.display = "block";
		
		zo = zo + 1;
		if(zo == 10)
			agr.style.display = "none";
		else
		{
			agr.style.display = "block";
		}
	}
	else // achica
	{
		do_zoom(nomobj , false);
		agr.style.display = "block";

		zo = zo - 1
		if(zo == 0)
			ach.style.display = "none";
		else
			ach.style.display = "block";
		
	}
	
}