function checkEmail() 
 {
	em = document.getElementById("Em").value;
	
	if (em == "") 
	{
           hideAllErrors();
           document.getElementById("emError").style.display = "inline";
           document.getElementById("Em").select();
           document.getElementById("Em").focus();
           return false;
        }    	

	if (em != "") 
    	{
    	    hideAllErrors();
    	    var emailpattern = /^.+@.+\..{2,3}$/;
    	    if(!emailpattern.test(em))
    	    {
    	        document.getElementById("emError").style.display = "inline";
    	        document.getElementById("Em").select();
    	        document.getElementById("Em").focus();
    	        return false;    
    	    } 
    	}    

  	return true;
  }
 
function hideAllErrors() 
{
	document.getElementById("emError").style.display = "none"
}