function Habilita(divID) {
  var item = document.getElementById(divID);
  if (item) {
    item.className=(item.className=='hidden')?'unhidden':'hidden';
  }
}

function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail address")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail address")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail address")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail address")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail address")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail address")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail address")
		    return false
		 }

 		 return true					
	}

function handleEnter (field, event) {
		var keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
		if (keyCode == 13) {
			var i;
			for (i = 0; i < field.form.elements.length; i++)
				if (field == field.form.elements[i])
					break;
			i = (i + 1) % field.form.elements.length;
			field.form.elements[i].focus();
			return false;
		} 
		else
		return true;
	}

function valid(f) {
var re = /^[0-9]*$/;
if (!re.test(f.value)) {
alert("Only numbers allowed!");
f.value = f.value.replace(/[^0-9]/g,"");
}
}

var highlightcolor='#fff4cf';
var ns6=document.getElementById&&!document.all;
var previous='';
var eventobj;
var intended=/INPUT|TEXTAREA|SELECT|OPTION/;
function checkel(which){
if (which.style&&intended.test(which.tagName)){
if (ns6&&eventobj.nodeType==3)
eventobj=eventobj.parentNode.parentNode;
return true;
}
else
return false;
}
function highlight(e){
eventobj=ns6? e.target : event.srcElement;
if (previous!=''){
if (checkel(previous))
previous.style.backgroundColor='';
previous=eventobj;
if (checkel(eventobj))
eventobj.style.backgroundColor=highlightcolor;
}
else{
if (checkel(eventobj))
eventobj.style.backgroundColor=highlightcolor;
previous=eventobj;
}
}