Tutorial Clear Field on Focus
by Unknown in javascript , Tutorial 0
<input type="text" onfocus="if(this.value == 'value') { this.value = ''; }" value="value" />
Replace "value" with the default value. If the field is selected, the default value will go away. If the user has previously changed the field value, it'll be left alone.
Alternatively, use onfocus="this.value='';" to always clear the field.