function reqField(obj){
	
	var ide     = obj.id;
	var message = obj.title;
	var valor   = obj.value;
	
	if (valor == message){
		obj.value = "";
		if(document.all){
 			obj.createTextRange().select();
 		}
	}
	
	if (valor == ""){
		obj.value=message;
	}

	if (obj.value == message){
		obj.style.color="red";
	} else {
		obj.style.color="#666666";	
	}
	return true;
	
}
//ej:
//<input type="text" id="fldBuscar" value="Buscar" title="Buscar" size="15" onfocus="reqField(this)" onblur="reqField(this)" />