function turn_over(name){if(document.images != null)document[name].src=document[name+"_over"].src;}
function turn_off(name){if(document.images != null)document[name].src=document[name+"_off"].src;}
function reg(name){if(document.images){document[name+"_off"]=new Image();document[name+"_off"].src="../nav/"+name+".gif";
document[name+"_over"]=new Image();document[name+"_over"].src="../nav/"+name+"_over.gif";}}

reg("nav01");reg("nav02");reg("nav03");reg("nav04");reg("nav05");reg("nav06");
reg("nav07");reg("nav08");reg("nav09");reg("nav10");reg("nav11");reg("nav12");

ax01.onmouseover=function(){turn_over("nav01");}; ax01.onmouseout=function(){turn_off("nav01");};
ax02.onmouseover=function(){turn_over("nav02");}; ax02.onmouseout=function(){turn_off("nav02");};
ax03.onmouseover=function(){turn_over("nav03");}; ax03.onmouseout=function(){turn_off("nav03");};
ax04.onmouseover=function(){turn_over("nav04");}; ax04.onmouseout=function(){turn_off("nav04");};
ax05.onmouseover=function(){turn_over("nav05");}; ax05.onmouseout=function(){turn_off("nav05");};
ax06.onmouseover=function(){turn_over("nav06");}; ax06.onmouseout=function(){turn_off("nav06");};
ax07.onmouseover=function(){turn_over("nav07");}; ax07.onmouseout=function(){turn_off("nav07");};
ax08.onmouseover=function(){turn_over("nav08");}; ax08.onmouseout=function(){turn_off("nav08");};
ax09.onmouseover=function(){turn_over("nav09");}; ax09.onmouseout=function(){turn_off("nav09");};
ax10.onmouseover=function(){turn_over("nav10");}; ax10.onmouseout=function(){turn_off("nav10");};
ax11.onmouseover=function(){turn_over("nav11");}; ax11.onmouseout=function(){turn_off("nav11");};
ax12.onmouseover=function(){turn_over("nav12");}; ax12.onmouseout=function(){turn_off("nav12");};