Fragony, can you be more specific about the "form thingie"? I use Safari a lot, and can't imagine what you might mean.
As Lemur says, Firefox on Mac is excellent and much better featured in many ways. The top ten sites feature on Safari isn't worth the hassle you seem to be experiencing - though it might be easily fixed.
EDIT: If you look in Preferences (tool bar Safari menu) and the Security tab, do you have a checkbox ticked at the bottom that says: Ask before sending a non-secure form from a secure website? If it's checked, maybe this is the problem. Try unchecking and testing.
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