i have created a script in php/mysql to update to a database table.the rows are listed ...and alongside each row i have submitted a radio button ...after selecting one radio button and clicking the update button which is given on the top,it goes to next page to update.... i want to ensure that atleast one radio button is clicked...if not i would like to show an error message when the user clicks the update button... won't radio button validation work like <select> tag validates...i tried but it isn't working...so any ideas???thanks in advance....