function gross(v_nr) {
        for (i=0; i<v_width.length; i++ ) {
             v_div = document.getElementById("grimg"+i);
	     wPos = 0;
	     if (typeof window.pageYOffset == "number") {
	        wPos = window.pageYOffset;
	     } else {
	        if (typeof document.documentElement.scrollTop == "number") 
		   wPos = document.documentElement.scrollTop - 310;
	     }

                if (i != v_nr) {
                   v_div.style.visibility = "hidden";
                   v_div.style.width = "0px";
                   v_div.style.height = "0px";
	   	   v_div.style.marginTop = '0px';
                } else {
                   v_div.style.width = v_width[i]+"px";
                   v_div.style.height = v_height[i]+"px";
		   if (v_div.offsetTop < wPos) {
		   	v_div.style.marginTop = wPos - v_div.offsetTop + 20+'px';
		   } else {
		   	v_div.style.marginTop = '0px';
		   }
                   v_div.style.visibility = "visible";
                }
        }
}