I need to change the background color of the text box based on the value the user enters. For instance if the value is less than 10 then I want the background to be blue, if it greater than 20 I want it to be red. Between 10 and 20 the background should remain white. I have tried changing the style.background property in the onBlur client event, but have not had any success. Any help would be appriciated.