function imgc(a,Bild)
{
        window.document.images[a].src=Bild.src;
}
function layer_on(lnr)
{
	
	 if (NS4) {
    			getElement("id", lnr).visibility = "show";
  		} else {
    			getElement("id", lnr).style.visibility = "visible";
  		}
   
 }
function layer_off(lnr)
{

 	if (NS4) {
    			getElement("id", lnr).visibility = "hide";
  		} else {
    			getElement("id", lnr).style.visibility = "hidden";
  		}              

        
 }