function checkEnter(e) { //e is event object passed from function invocation
		var characterCode 		
		if(e && e.which){ //if which property of event object is supported (NN4)
			e = e
			characterCode = e.which //character code is contained in NN4's which property
		}
		else{
			e = event
			characterCode = e.keyCode //character code is contained in IE's keyCode property
		}		
		if(characterCode == 13){ //if generated character code is equal to ascii 13 (if enter key)
			login_frm_validate();
			return false;
		}
		else{
			return true 
		}		
	}
	
	function subheader_checkEnter(ev) { //ev is event object passed from function invocation
		var characterCode1 		
		if(ev && ev.which){ //if which property of event object is supported (NN4)
			ev = ev
			characterCode1 = ev.which //character code is contained in NN4's which property
		}
		else{
			ev = event
			characterCode1 = ev.keyCode //character code is contained in IE's keyCode property
		}		
		if(characterCode1 == 13){ //if generated character code is equal to ascii 13 (if enter key)
			if(IsBlank('header_search_frm','header_search_word')) { 
				alert("Search word is Empty/Invalid");
				return false;   
	 		}
	 		else {
			   document.header_search_frm.action = "quick_search.php"; 
			   document.header_search_frm.submit(); 
			   return false;
			}
		}
		else{
			return true 
		}		
	}