//--------------------------------------------------------------------------------------------------------------------
function Enviaemail(){
if(document.form1.nombre.value==""){
alert("INGRESE SU NOMBRE");
document.form1.nombre.focus();
return;
}
if(document.form1.email.value==""){
alert("INGRESE SU E-MAIL");
document.form1.email.focus();
return;
}
if ((document.form1.email.value.indexOf ('@', 0) ==-1)||(document.form1.email.value.length < 5)){ 
alert('E-MAIL INVALIDO'); 
document.form1.email.focus();
return ;
}
document.form1.submit();
}
//-----------------------------------------------------------------------------------------------------------