How do I make the dialog window resize when it's content change and not show the side scrolls?

How do I make the dialog window resize when it's content change and not show the side scrolls?


I have a form that I load in a dialog window using:
$("#somediv").load('form.html').dialog({modal:true});

it works great but when I submit the form the validation script displays the errors if fields are missing, which make the page longer and the side scroll appear, any way to have the dialog re size itself and not show the scrolls?

thanks