function IsEmpty(aTextField, msg) {
//  if ((aTextField.value=="") ||   (aTextField.value==null))   
    if (aTextField.value=="")   
  {
   		alert("Please Enter "+msg);
	   	aTextField.value="";
	   	aTextField.focus();
   
      return false;
   }
   else{ return true; }
}	

	
	function IsNumeric(aTextField, msg)
	   {
			if(isNaN(aTextField.value)) 
		   { 
		     alert("Invalid data format in "+msg+"\n\nOnly numbers are allowed."); 
			  aTextField.value="";
			  aTextField.focus(); 
		     return false; 
		   }   
		   	return true;
   }

	
	

function checkEmail(aTextField){
			if ((aTextField.value.search("@") == -1 ) || (aTextField.value.search("[.*]" ) == -1 ) ) 
			{
				alert( "Please enter valid email address" );
				aTextField.value="";
				aTextField.focus();
				return false
			} 
			else 
			{
				return true;

			}
		}

function checkDomain(aTextField){
			if (aTextField.value.search("[.*]") == -1) 
			{
				alert( "Please enter valid Domain Name extensions. (Eg. .com, .org, .info or .net)" );
				aTextField.value="";
				aTextField.focus();
				return false
			} 
			else 
			{
				return true;

			}
		}