They both work BUT which is better and more correct to use src="images/rate/1.gif" onMouseOut=this.src="images/rate/1.gif" onMouseOver=this.src="images/rate/1c.gif" or src="images/rate/1.gif" onMouseOut="this.src='images/rate/1.gif';" onMouseOver="this.src='images/rate/1c.gif';" HTML: