Javascript for textbox auto value Display

This code is used to display auto

value of the textbox when there is no text 

entered in it.....  

<input style="" name="text" size="45" value="Search"  

onfocus="if(this.value=='Search')this.value=''; 

this.style.color='black';" onblur="if(this.value=='')

{ this.value = 'Search'; this.style.color='';}" type="text">