function switchvis(id, visibility){ 
   if(document.getElementById(id)){    
       var ele = document.getElementById(id);   
       ele.style.display=visibility; 
   } 
} 

function switchcolor(id, color){ 
   if(document.getElementById(id)){    
       var ele = document.getElementById(id);   
       ele.style.color=color; 
   } 
} 

function validateEmail(email)
{
   return (email.match(/\w*@\w.*\.\w\w*/)!=null);
}