Apparently no body likes javascript here, And this is more a javascript question than perl.

Anyway, Your javascript code should look like this

if ( confirm('are you sure you want to use the name' + sname) ) { 
return true;
}else{
return false;
}
[download]

when your javascript function returns false, your form wont be submitted, so you don't need to refresh the page.

When OK clicked the form will be submitted and you'll have to do the rest through your perl code.