Selenium RC: how to click an item present in column of a table

Say i have a table contains nos of rows which is not known. exp column1 column2 column3 xxx yyy "Search Profile"

Column3 for each row contains a Link "Search Profile" now it's clear here that xpath of this link will be changing according to the row. now i want to search a string in column 2 and if present then needs to click it's column3 link. Can anybody please let me know how to search and click it?