function validate_required(field,alerttxt){
with (field){
if (value==null||value==""){
alert(alerttxt);
return false;
}
return true;
}
}
function validate_email(field,alerttxt){
with (field){
apos=value.indexOf("@");
dotpos=value.lastIndexOf(".");
if (apos<1||dotpos-apos<2){
alert(alerttxt);
return false;
}
return true;
}
}
function validate_form(thisform){
with (thisform){
if(!validate_required(name, "Name must be filled out!")){
name.focus();
return false;
}
if(!validate_required(tel, "Phone must be filled out!")){
tel.focus();
return false;
}
if(!validate_required(email, "Email must be filled out!")){
email.focus();
return false;
}
if(!validate_email(email,"Not a valid e-mail address!")){
email.focus();
return false;
}
if(!validate_required(msg, "Message must be filled out!")){
msg.focus();
return false;
}
}
return true;
}