You can use this online tool to generate the HTML and Javascript source code for a rollover effect that turns text to bold when the mouse rolls over it (on mouseover) and then back to normal text when the mouse moves away (on mouseout).
Try it out:Roll your mouse over this text. Make your own: Fill in the form field below then click on SHOW to display your code in the textbox at the bottom of the form. You can click on RESET to clear the form and start over.