form.submit();

document.FORM_NAME.action="page.php";
document.FORM_NAME.submit();

Javascript form submit

document.FORM_NAME.action="page.php";
document.FORM_NAME.submit();

you can call a function in javascript onclick event of any 
form element/link and in the function you  use any 
document.formName.submit(); to submit the form

and above all ans is rights

ys

Using curl

by javascript

1 Function OnChange();
2. Function OnClick()

Use image element instead submit button
<input type="img" src="img_path/img_name.src">
give the action page name as action attribute in form 
element like
<form name="myform' action="myaction.php">
The Image element will work very similar as submit button.

on the page unload event write down the submit coding. or 
use onBlur event thats also the same functionality. and 
call the java script function on Blur. it will submit the 
page on closing you dont need to press submit button.