var globaljs_expresionmail = /^[A-Za-z0-9][A-Za-z0-9_.-]*@[A-Za-z0-9_-]+\.[A-Za-z0-9_.-]+[A-za-z-]$/;
var globaljs_expresionurl = /(http):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/;
var globaljs_expresion_imagenes = new RegExp(".(gif|jpg|png|bmp|jpeg)$","i");
var globaljs_expresion_bases = new RegExp(".(mdb|xls|ccdb|xlsx)$","i");
var globaljs_expresion_access = new RegExp(".(mdb|ccdb)$","i");
var globaljs_expresion_pdf = new RegExp(".(pdf)$","i");
var globaljs_expresion_archivos = new RegExp(".(doc|txt|pdf|ppt|docx|cad|zip|rar|xls|mdb|gif|jpg|png|bmp|jpeg)$","i");
var globaljs_expresionusuario=/^[A-Za-z0-9-]*$/;

function objAjax(){
	var peticion = false; 
	try { peticion = new XMLHttpRequest(); } catch (trymicrosoft) { 
	try { peticion = new ActiveXObject("Msxml2.XMLHTTP"); } catch (othermicrosoft) { 
	try { peticion = new ActiveXObject("Microsoft.XMLHTTP"); } catch (failed) { 
			peticion = false; }}}
	return peticion;
}

function $(id){return document.getElementById(id);}
function $$(name){return document.getElementsByName(name);}
function dvisible(id){$(id).style.visibility='visible'}
function dhidden(id){$(id).style.visibility='hidden'}
function dnone(id){$(id).style.display='none'}
function dinline(id){$(id).style.display='inline'}
function dblock(id){$(id).style.display='block'}
function trim(str){return str.replace(/^\s+|\s+$/, '');}
function txaSinSalto(objeto){objeto.value = objeto.value.replace(/\s*[\r\n][\r\n \t]*/g, "");}
function marcartodos(name)	{ var chk;chk=$$(name); 	for(i=0;i<chk.length;i++){chk[i].checked=true;} }
function desmarcartodos(name){ var chk; chk=$$(name); for(i=0;i<chk.length;i++){chk[i].checked=false;	}}
function simplejx(accion, pagina){
	var oajax=new Xajax();
	oajax.clearParameters();
	oajax.setParameter('accion',accion);
	oajax.Callback=function(){
		if(accion!=''){ $(accion).innerHTML=oajax.getRespuesta(); }
	}
	oajax.SendPost(pagina, true);	
}

function limitar(id,largo){
	var cadena=$(id).value;
	var cantidadenters=0;
	var x;
	x=cadena.split("\n");
	cantidadenters=x.length-1;
	if ($(id).value.length>=(largo-cantidadenters)){$(id).value=$(id).value.substring(0,largo-cantidadenters);}
}
function plop(id){
	if($(id).style.display=='block'){	$(id).style.display='none';}
	else if($(id).style.display=='none'){	$(id).style.display='block';}
}


/*
function v_clave(){
	var errores = '';
	if($('').value==''){ errores+='*  \n'; }
	if(errores!=''){ alert('Los siguientes campos son obligatorios:\n' + errores) }
	else{ $('').submit(); }
}
*/