1. A system for securing online chat conversations, comprising: a chat conversation capture system that captures a chat conversation into an image file; a watermarking system for adding a watermark to the image file to produce a watermarked image file; a watermark extraction system for extracting the watermark from the watermarked image file; and a validation system for validating the watermark; wherein the watermarking system and watermark extraction system both utilize the same algorithm to insert and extract the watermark; wherein the chat conversation capture system, the watermarking system, the watermark extraction system and the validation system are integrated into an online chat program; and wherein the watermark is used to determine whether or not the image file of the chat conversation has been modified.