I got 6 error messages this evening from my website as follows:

Sun Apr  6 23:41:46 2008] [error] [client 66.174.92.169] File does not exist: /home/xxxx/public_html/images/general/hospital_small.gif.vco_2_4000_64_vco
[Sun Apr  6 23:41:46 2008] [error] [client 66.174.92.169] File does not exist: /home/xxxx/public_html/images/general/riverwalk1.jpg.vco_3_4000_70_vco
[Sun Apr  6 23:41:46 2008] [error] [client 66.174.92.169] File does not exist: /home/xxxx/public_html/javascript/global_java.js.vco_4_2_0_vco
[Sun Apr  6 23:41:46 2008] [error] [client 66.174.92.169] File does not exist: /home/xxxx/public_html/images/general/fireman_small.gif.vco_2_4000_64_vco
[Sun Apr  6 23:41:45 2008] [error] [client 66.174.92.169] File does not exist: /home/xxxx/public_html/images/general/christmas_tree_small.gif.vco_2_4000_64_vco
[Sun Apr  6 23:41:45 2008] [error] [client 66.174.92.169] File does not exist: /home/xxxx/public_html/images/general/jl_icon1.gif.vco_2_4000_64_vco

This guy went through lots and lots of my gifs according to my log files.  But he tried to run the "vco...."thing on these 5 gifs and one of my javascript files, which generated the 404 error messages.  I can't find anything on Google about the "vco...." thing.  I'm sure he was up to know good as I had an http insertion attack attempt on my website this morning but my blocks I have in my .htaccess file stopped that.  He also went through my SMF files, looking at lots of the gifs and javascript files there. 

Does anyone know what he was attempting to accomplish with the "vco...."thing? Thanks for any info.

Thanks Mitch.  I checked my files as best I can and can't see anything that was changed.