function pulsaEnter (field, evt,control) 

		{

			var keyCode = evt.which ? evt.which : evt.keyCode;
			if (keyCode == 13) 
			{
			
				document.getElementById(control).click();
				return false;
			}
			else
			{
			
				return true;
			}
		}
		
 function supportsDynamicLabels() {
     return     document.getElementById &&     (window.attachEvent ||window.addEventListener) &&     null == navigator.appVersion.match(/Safari\/\d+$/);     }
    
    function addEvent(objObject, strEventName, fnHandler) {
      if (objObject.addEventListener)
        objObject.addEventListener(strEventName, fnHandler, false);
      else if (objObject.attachEvent)
        objObject.attachEvent("on" + strEventName, fnHandler);
    }
    function getEventSrc(e) {
      if (!e) e = window.event;
      if (e.target)
        return e.target;
      else if (e.srcElement)
        return e.srcElement;
    }
    
     function setupClicks()
     {
     
		if(document.getElementById("ctl00_WUCBuscadorRapido_txtBuscar")!=null)
		{
			var objField = document.getElementById("ctl00_WUCBuscadorRapido_txtBuscar");
			addEvent(objField, "click", borrarValor);
		}
		
		if(document.getElementById("ctl00_WUCCabUsuDcha_txtUsuario")!=null)
		{
			var objField = document.getElementById("ctl00_WUCCabUsuDcha_txtUsuario");
			addEvent(objField, "click", borrarValorUsuario);
		}
		
		
	}

function borrarValorUsuario(event)
{
    obj=getEventSrc(event);
		if(obj.value=="Usuario")
		{
			obj.value="";
		}

}
	 
	 function borrarValor(event)
	 {
	  obj=getEventSrc(event);
		if(obj.value=="Texto a buscar")
		{
			obj.value="";
		}
	 
	 }
	 
     if (supportsDynamicLabels()) {
      addEvent(window, "load", setupClicks);
    }