<a href="?a=home" <IMG SRC="images/home.jpg" NAME="mypic1" BORDER=0 onMouseOver="anim1(this)" onMouseOut="stat1(this)" /> </a>
замени на
<img src="images/home.jpg" id="mypic1" name="mypic1" border=0 onMouseOver="anim1(this)" onMouseOut="stat1(this)" />