function validar_form(formulario) {
	var er_email = /^[A-Za-z][A-Za-z0-9_]*@[A-Za-z0-9_]+\.[A-Za-z0-9_.]+[A-za-z]$/;


if(formulario.nombres.value == "") {
		alert ('Ingrese un Nombre y apellido');
		return false;
	}

	if(formulario.email.value == "") {
		alert ('Ingrese un e-mail');
		return false;
	}
	if(!er_email.test(formulario.email.value)) {
		alert('Ingrese un e-mail valido');
		return false;
	}

}

function limpia(elemento)
{
elemento.value = "";
}

function verifica(elemento)
{
if(elemento.value == "")
elemento.value = "Nombre y apellido";
}

function verifica2(elemento)
{
if(elemento.value == "")
elemento.value = "E-mail";
}





// navigation functions

function dnavOn(navName) {
	if (document.getElementById) {
		if (document.getElementById(navName).className != 'dnav-select') {
			document.getElementById(navName).style.background = '#ede9e6';
		}
	}
}

function dnavOff(navName) {
	if (document.getElementById) {
		if (document.getElementById(navName).className != 'dnav-select') {
			document.getElementById(navName).style.background = '#ffffff';
		}
	}
}


function showMenu(divName) {
	if (document.getElementById) {
		document.getElementById(divName).style.display = 'block';
	}
}

function hideMenu(divName) {
	if (document.getElementById) {
		document.getElementById(divName).style.display = 'none';
	}
}


function setupExternalLinks() {
  var links = document.getElementsByTagName('a');
  for (var i = links.length; i != 0; i--) {
    var a = links[i-1];
    if (!a.href) continue;

    if (a.href.indexOf('http') != -1 &&
            a.href.indexOf(window.location.hostname) == -1 &&
      !excludeUrl(a.href)
        ) {
      a.onclick = function() {
                openExternalLink(this.href, this.target);
                return false;
            }

    }
  }
}

function excludeUrl(url){
  var excludeUrls = Array('http://www.dispronet.com.ar',
'http://www.clubd.com.ar'
              );

  for(var l = 0; l < excludeUrls.length; l++){
    if(url.indexOf(excludeUrls[l]) == 0){
      return true;
    }
  }

  return false;
}
/* crucigrama */
function mayuscula(id) {
	val = document.getElementById(id).value;
	document.getElementById(id).value = val.toUpperCase();
}
function proxcasilla(n, m) {
	m++;
	prox = 'casilla-'+n+'-'+m;
	m++;
	prox2 = 'casilla-'+n+'-'+m;
	n++;
	prox3 = 'casilla-'+n+'-0';
	val1 = document.getElementById(prox);
	val2 = document.getElementById(prox2);
	val3 = document.getElementById(prox3);
	if(val1) { val1.focus(); return; }
	if(val2) { val2.focus(); return; }
	if(val3) { val3.focus(); return; }
}