function fn_blankfield(txtField, msg)
	{
		var field_ID = document.getElementById(txtField);
		if (field_ID != null)
		{
			if (field_ID.value == "")
			{
				alert(msg + " cannot be blank!");
				field_ID.focus();
				return false;
			}
		return true;
		}
	}
	function clickButton(e, buttonid)
	{ 
				var bt = document.getElementById(buttonid); 
				if (typeof bt == 'object')
				{ 
							if(navigator.appName.indexOf("Netscape")>(-1)){ 
										if (e.keyCode == 13){ 
													bt.click(); 
													return false; 
										} 
							} 
							if (navigator.appName.indexOf("Microsoft Internet Explorer")>(-1)){ 
										if (event.keyCode == 13){ 
													bt.click(); 
													return false; 
										} 
							} 
				} 
	}
	////////////////////////////////////
	var form_submitted = false;
	function submit_form()
	{
	if (form_submitted)
	{
		alert( "Your form has already been submitted. Please wait for some time and click OK to continue!" );
		form_submitted = false;
		return false;
	}
	else
	{
		form_submitted = true;
		return true;
	}
	}