Text box

[d-machine]

I have a simple text box with value: "Write in here"
How can I delete the value of the text box when the mouse click on the text box in order to write in it?

Thanks

[jscheuer1]

<input type="text" value="Write in here" onfocus="if(this.value == 'Write in here') this.value = '';">

[d-machine]

Thank you very much!