Basically I need a really simple canvas on a page where a user can doodle his signature and when the form is submitted on said page the signature in question gets saved server-side. The form on the page with the canvas doesn't contain any input boxes but does however contain some hidden form data. The script I'm working on has a PHP frontend with a MySQL backend. Look at the image submitted which shows the canvas placeholder.
When hovering over the canvas all it needs is a crosshair, no need for a toolbar whatsoever except for a reset button and a sensible size of the pen and a canvas size of 600x300px.
Of course the name of the saved file would have to get posted to the next page in question which also stores the form data.