function ShowLayers(c,d)
{ 
 for(i=1;i<=d;i++)
 {
  eval("content" + i).style.display="none";
  eval("title"+i+".style.backgroundImage='url(\"ico\/menu-on.jpg)\';");
 }
 eval("title"+c+".style.backgroundImage='url(\"ico\/menu-off.jpg)\';");
 eval("content" + c).style.display="";
}