I was updateding my shopping cart and the next thing i knew i was getting this error

Fatal error: Call to undefined function: themeheader() in /www/s/sweetquads/htdocs/header.php on line 47

I dont know what i could have done to mess it up i was just editing products, now my whole site is down??

H-E-L-P

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http://sweetquads.com/images/logosmall.jpg

Read this http://nukemods.com/modules.php?name...or+themeheader

For whatever reason, the site came back up after a couple of min. I did not do anything to get it back up. I posted here then went back to my site and whammo it worked, so im not sure what the deal was.
Anyway thanks for trying to help

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http://sweetquads.com/images/logosmall.jpg