button works but appears to not link even though it does!

Hi, I worked out how to change the behaviour of the 'back to shopping button' in the shopping cart by using this thread;

http://www.zen-cart.com/forum/showthread.php?t=64540&page=4

I wanted my button to just go back which it does thanks to the person who worked out how to do it and I changed the button image to my own, but for some reason when you hover over the button the curser doesnt change to show that it works if you know what I mean? The button actually works fine, just a small thing but I think it needs fixing. I'm not sure if you can view the button without logging in but its in the shopping cart once you're logged in and have added something to the basket. My site is at;

http://www.thegreatgiftshop.co.uk/zencart/index.php?main_page=login

Anyone know how I can get this button to appear properly when you mouse over it?

This is because the button is inside a java script event.

~Melanie

how do I make it so it isnt then? But so the button still works and clicks to back