function somente_numero(campo){

        var digits="0123456789";
        var campo_temp ;
        for (var i=0;i<campo.value.length;i++){
                campo_temp=campo.value.substring(i,i+1);
                if (digits.indexOf(campo_temp)==-1){
                        alert("Este campo deve conter apenas valores numericos");
                        campo.value = campo.value.substring(0,i);
                        break;
                }
        }
}

function submitAltera() {
        alert("submit");
        document.getElementById("end").submit();
}
/*
messageObj = new DHTML_modalMessage();    // We only create one object of this class
messageObj.setShadowOffset(5);    // Large shadow
function displayMessage(url)
{
   messageObj.setSource(url);
   messageObj.setCssClassMessageBox(false);
   messageObj.setSize(600,600);
   messageObj.setShadowDivVisible(true);    // Enable shadow for these boxes
   messageObj.display();
}
function closeMessage()
{
   messageObj.close();   
}
*/