function cf(obj){
	if( obj.defaultValue==obj.value) obj.value="";
}
function rf(obj){
	if(obj.value =="")obj.value=obj.defaultValue;
}
// toggle visibility

function toggle( targetId ){
  if (document.getElementById){
  		target = document.getElementById( targetId );
  			if (target.style.display == "none"){
  				target.style.display = "";
  			} else {
  				target.style.display = "none";
  			}
  	}
}