[gray]// exactly what you asked for[/gray]
<input type="text" value="Enter search term" onfocus="this.value=''">
[gray]// empty only the default text[/gray]
<input type="text" value="Enter search term" onfocus="if(this.value=='Enter search term')this.value=''">
[gray]// restore the default text too[/gray]
<input type="text" value="Enter search term" onfocus="if(this.value=='Enter search term')this.value=''" onblur="if(this.value=='')this.value='Enter search term'">