a better way would be to create one function and execute the others within... You also do not want to try and execute a function with a submit button the way you have... include the submission in part of the function or do an onSubmit in the <form> tag.
<script>
Function doFunctions() {
function1();
function2();
function3();
return true; // submits form
}
</script>
<form onSubmit="doFunctions();"
<input type="Submit">
</form>