Can anybody help me please???

Hello everybody, Does any1 know how 2 search for a contain keyword in an MySQL database using PHP. For example if i search for ummmm lets say "fo" then it would display everything which has those letters in it like "fo"rd or "fo"cast. I already have a piece of the code: $result = mysql_query("SELECT * FROM tablename WHERE columnname = \"$textboxname\",$db); except for that one little command. i've been trying 2 figure it out for months with no luck, if anybody knows how, could u please reply Thank You in advanced :-)