if (document.images) {
    arImLoad = new Array (
       "images/a12.gif",	   
       "images/a22.gif",
       "images/a32.gif",
       "images/b12.gif",	   
       "images/b22.gif",	   
       "images/b32.gif",	   
       "images/b42.gif",
       "images/b52.gif",
       "images/b62.gif",
       "images/b72.gif",
       "images/b82.gif",
       "images/d12.gif",
       "images/d22.gif"	   
		);
    arImList = new Array ();
    for (counter in arImLoad) {
        arImList[counter] = new Image();
        arImList[counter].src = arImLoad[counter];
    }
}
    function navOver(dir,over) {
	if (!document.images) {return};
		whichIm2 = document.images[dir];
	if (over) { 
				whichIm2.src = "images/" + dir + "2.gif";}
             else { 
				 	whichIm2.src = "images/" + dir + "1.gif";}
    }