function showContactBL(idoflayer) {
     var whichLayer = idoflayer;

     if (document.getElementById) 		{
          var style2 = document.getElementById(whichLayer).style;
          var allPageTags=document.getElementsByTagName("div");

          for (i=0; i<allPageTags.length; i++) {

          if (allPageTags[i].className=='contactBL') {
        allPageTags[i].style.display='none';
                                                     }
        }

        style2.display = style2.display? "inline":"inline";
     }
}