Clean up website code for validation

DO NOT CONTACT ME DIRECTLY THROUGH THE WEBSITE. CONTACT ME ONLY ON GAF I need my clients website code (joomla 1.5.x) to be cleaned up. I had a customer tell me that she Googled Oasis and the first selection was "Oasis one-hour vacation" she selected that but it turned out to be a trojan. A couple of days ago I had a guy tell me he got a security flag when he went to our site. Here are the current errors... [login to view URL];charset=(detect+automatically)&doctype=Inline&group=0 What I need........ 1. All markup validation errors fixed 2. Sweep website for trojans and remove