<script>function changeAPEXtoHTML(){
html_GetElement('P64_ITEM1').name = 'ITEM1';
html_GetElement('wwvFlowForm').action='https://somewebsite.com/cart.php';
html_GetElement('wwvFlowForm').value='Pay';
html_GetElement('wwvFlowForm').name='Submit';
}
</script>

HTML Body Attribute

OnLoad="changeAPEXtoHTML()"