2 form actions, one submit button… how?

Hi,
I need to combine these two actions, but can one get one to work at a time. How can I get them both to work when the submit button is pressed?

onsubmit=”return testCreditCard(this)”
onsubmit=”if( CheckForm(this)){ SetCookie (‘NumberOrdered’, 0, null, ‘/’); return true;} else { return false; }”

thanks

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