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

}
document.form1.submit();
}
//-----------------------------------------------------------------------------------------------------------