function isNotEmpty(elem) {
	var str = elem.value;
    var re = /.+/;
    if(!str.match(re)) {
        alert("Debes llenar el campo en el que esta el cursor.");
        setTimeout("focusElement('" + elem.form.name + "', '" + elem.name + "')", 0);
        return false;
    } else {
        return true;
    }
}

function focusElement(formName, elemName) {
    var elem = document.forms[formName].elements[elemName];
    elem.focus();
    elem.select();
}

function validateForm(form) {

    if (isNotEmpty(form.elements[0])) 
	{ return true; }
	
    return false;
}
function expande(a)
{
	a=document.getElementById(a);
	a.style.display=(a.style.display=='none')?'block':'none';
}