function checkEmptySearch(objSearch,fieldSearch) {
	if(document.getElementById(fieldSearch).value != '') {
		document.getElementById(objSearch).submit();
	} else {
		alert('Ingrese el texto que desea buscar');
		document.getElementById(fieldSearch).focus();
	}

}

function checkField(e,objSearch,fieldSearch){
	var search_field = document.getElementById(fieldSearch).value;
	var GKO = (navigator.userAgent.toLowerCase().indexOf('gecko')!=-1);
	var evtobj = e.keyCode? e.keyCode: e.charCode;
	// si no esta enfocado ningun textarea
	if(GKO) {
		if ((evtobj == 13) && (search_field != '')) {
			checkEmptySearch(objSearch,fieldSearch);
		}
	} else {
		if ((evtobj == 13) && (search_field != '')){
			checkEmptySearch(objSearch,fieldSearch);
		}
	}
}