function ValidarFormRadio(form){ 

	if(document.frmRadio.txt_nombre.value == "")
	alert("You have to type your name");
	input= document.frmRadio.txt_email;
	return ValidEmail(input);

	return true;

} 

function ValidEmail(input){
	var pos1, pos2, bOk = true; 
	var sDir = input.value; 
	if (sDir == ""){ 
		alert("and don't forget type your email address"); 
		input.focus(); 
		return false; 
	} 
	pos1 = sDir.indexOf('@', 0); 
	pos2 = sDir.indexOf('.', 0); 
	bOk = bOk && (pos1 > 0); 
	bOk = bOk && (pos2 != -1); 
	bOk = bOk && (pos1 < pos2 - 1); 
	bOk = bOk && (pos2 < sDir.length - 1); 
	if (!bOk){ 
		alert("Invalid email address"); 
		input.focus(); 
		return false; 
	}   
	return true;
}