Add to Head

<SCRIPT LANGUAGE="JavaScript">
<!--

/*
Arrow onMouseover
By Clarence Eldefors (http://www.freebox.com/cereweb)
Visit http://javascriptkit.com for this and over 400+ other scripts
*/

IMAGE01 = "on.gif"  
IMAGE02 = "off.gif"

function imgover(imgname){
     imgname.src = IMAGE01
}

function imgout(imgname){
     imgname.src = IMAGE02
}
//-->
</SCRIPT>

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Step 2: Here is the code for a link using the array´s. If you want more than one link, then copy this code and change all IMAGE01 to IMAGE02 Then just add one number for additional links (eg. IMAGE03, IMAGE04 etc.)

<IMG NAME="IMAGE01" SRC="off.gif" WIDTH=10 HEIGHT=10 BORDER=0> 
<A HREF="http://www.altavista.com" onMouseOver="imgover(IMAGE01)" onMouseOut="imgout(IMAGE01)">Altavista</A>

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Download on.gif, off.gif