function showhide(sh){

if(sh) {
disp="inline";
zi=100;
}else{
disp="none";
zi=-10;
}

for (i=0; i<document.getElementsByTagName("*").length; i++) {
  if (document.getElementsByTagName("*").item(i).className == "sourceReferral"){
   document.getElementsByTagName("*").item(i).style.display=disp;
   document.getElementsByTagName("*").item(i).style.zIndex=zi;
  }
}

}