function jsWebmail(id_form){
	$('form_webmail').elements['_user'].value = $('form_webmail').elements['_user'].value + '@desknet.com.br';
	// alert($('form_webmail').elements['_user'].value); // = $('login') + '@desknet.com.br';
	// $('fi_investimento').elements['investimento[qt_adquirida]'].value
	var _path = "http://mail.desknet.com.br/index.php";
	var params = Form.serialize(id_form);

	// alert(params);
	window.open( _path + '?' + params, 'Webmail', 'titlebar=no,toolbar=no,directories=no,status=no,menubar=no,width=800,height=600'			);
}

function dominio() 
{ 
	var sLogin=document.form._user.value; 
	
	if (sLogin != '') 
	{
		if (sLogin.indexOf('@') == -1) 
		{ 
			document.form._user.value = document.form._user.value +'@desknet.com.br'; 
		} 
	}
}

Event.observe( window, 'load', function(e){
	Event.observe( $('form').elements['_user'], 'blur', dominio );

//	_user
});