function ValidNewSletter()
   {
   var element;
   if(document.getElementById('LeftMenu_NewsLetter_txtSubscriber'))
   {
        element=document.getElementById('LeftMenu_NewsLetter_txtSubscriber');
   }
   if(document.getElementById('ctl00_LeftMenu_NewsLetter_txtSubscriber'))
   {
        element=document.getElementById('ctl00_LeftMenu_NewsLetter_txtSubscriber');
   }
    if(element.value=='')
    {
            alert('Please enter email address.');
            return false;
    }
    else if(element.value=='Enter your Email address')
    {
            alert('Please enter email address.');
            return false;
    }
    else
        return true;
   }
   function clear_text()
   {    
         if(document.getElementById('LeftMenu_NewsLetter_txtSubscriber') && document.getElementById('LeftMenu_NewsLetter_txtSubscriber').value=="Enter your Email address")
         {
               document.getElementById('LeftMenu_NewsLetter_txtSubscriber').value="";
         }
        if(document.getElementById('ctl00_LeftMenu_NewsLetter_txtSubscriber') && document.getElementById('ctl00_LeftMenu_NewsLetter_txtSubscriber').value=="Enter your Email address")   
       {
            document.getElementById('ctl00_LeftMenu_NewsLetter_txtSubscriber').value="";
        }    
        return false;
  }
       
   function Change()
   {  
         if(document.getElementById('LeftMenu_NewsLetter_txtSubscriber')!=null && document.getElementById('LeftMenu_NewsLetter_txtSubscriber').value=='')
            document.getElementById('LeftMenu_NewsLetter_txtSubscriber').value="Enter your Email address";
        if(document.getElementById('ctl00_LeftMenu_NewsLetter_txtSubscriber')!=null  && document.getElementById('ctl00_LeftMenu_NewsLetter_txtSubscriber').value=='')
            document.getElementById('ctl00_LeftMenu_NewsLetter_txtSubscriber').value="Enter your Email address";
            return false;
   }