function validateLogin(id,event){
  
  if(window.event)
    key = window.event.keyCode;     //IE
  else
    key = event.which;   //moz
//alert(key);
  var valclick="";
  if (navigator.appName=="Netscape")   //moz
  {
    valclick=1;
  }
  if (navigator.appName.indexOf("Microsoft")!=-1)  //IE
  {
    valclick=0;
  }
  if (key == 13 || key==valclick )
   {  

       var if_error=false;
        var strmssg="";
       var objerrdiv=document.getElementById(id);
       if((document.getElementById('txtusername').value=="")||(document.getElementById('txtpassword').value==""))
       {
         if_error=true; 
         strmssg=no_username_password;
       }
      
       if(!if_error)
       {
         if(CheckEmail(trim(document.getElementById('txtusername').value))==false) //checks for valid email address
         {  
            strmssg=valid_email; 
            document.getElementById('txtusername').focus();             
            if_error=true;
         }   
       }
       
       if(if_error)
       {  
        objerrdiv.innerHTML=strmssg;       
        return false;
       }
       else 
       {    
          document.frmLogin.action=SITE_URL+"login.php";
          document.frmLogin.submit();
       }
    }
}