function envia(url, metodo, modo)

{

    var cad_login = document.getElementById('frm_web').cad_login.value;

    remoto  = new ajax();

    xmlhttp = remoto.enviar(url + "?cad_login=" + cad_login, metodo, modo );

    if(xmlhttp) {

        document.getElementById("alerta").innerHTML = '<img src="images/nao.gif" alt="" width="16" height="16" hspace="4" vspace="0" align="absmiddle" /><font color="red"><strong>Login inválido! Altere.</strong></font>';

    } else {

        document.getElementById("alerta").innerHTML = '<img src="images/sim.gif" alt="" width="16" height="16" hspace="2" vspace="0" align="absmiddle" /><font color="#009933"><strong>Login Válido.</strong></font>';

    }    

	

	    if(xmlhttp) {

        document.getElementById("alerta2").innerHTML = '<img src="images/nao.gif" alt="" width="16" height="16" vspace="2" hspace="4" vspace="0" align="absmiddle" /><font color="red"><strong>Login inválido. Confira o campo Login.</strong></font>';

    } else {

        document.getElementById("alerta2").innerHTML = '';

    } 

	

}