$.fn.equalizeCols = function(){
    var maxH = 0;
    this.each(
	    function(i) 
	    {
			if (this.offsetHeight>maxH) maxH = this.offsetHeight;
	    }
    ).css("height", "auto").each(
	    function(i)
	    {
        var gap = maxH-this.offsetHeight;
        if (gap > 0)
        {
			$(this).css("height",maxH-1+"px");
			if (this.id == "col-izquierda") {
				t = document.createElement('div');
				$(t).attr("class","fill").css("height",gap+"px");
				$(this).children(':last-child').after(t);			
			}
        }
      }  
    );
  };