<!--
// PRELOADING IMAGES
if (document.images) {
 btn1_down=new Image(); btn1_down.src="images/btn1down.gif"; 
 btn1_up  =new Image(); btn1_up.src  ="images/btn1up.gif"; 

 btn2_down=new Image(); btn2_down.src="images/btn2down.gif"; 
 btn2_up  =new Image(); btn2_up.src  ="images/btn2up.gif"; 

 btn3_down=new Image(); btn3_down.src="images/btn1down.gif"; 
 btn3_up  =new Image(); btn3_up.src  ="images/btn1up.gif"; 

 btn4_down=new Image(); btn4_down.src="images/btn2down.gif"; 
 btn4_up  =new Image(); btn4_up.src  ="images/btn2up.gif"; 
}

// EVENT HANDLERS
function pressButton(btName) {
 if (document.images)
  eval('document.'+btName+'.src='+btName+'_down.src');
}

function releaseButton(btName) {
 if (document.images)
  eval('document.'+btName+'.src='+btName+'_up.src');
}
//-->