<!--
// PRELOADING IMAGES
if (document.images) {
 a_img_on =new Image();  a_img_on.src ="imgs/block/a-block_on.jpg"; 
 a_img_off=new Image();  a_img_off.src="imgs/block/a-block.jpg"; 
 b_img_on =new Image();  b_img_on.src ="imgs/block/b-block_on.jpg"; 
 b_img_off=new Image();  b_img_off.src="imgs/block/b-block.jpg"; 
 c_img_on =new Image();  c_img_on.src ="imgs/block/c-block_on.jpg"; 
 c_img_off=new Image();  c_img_off.src="imgs/block/c-block.jpg";
 d_img_on =new Image();  d_img_on.src ="imgs/block/d-block_on.jpg"; 
 d_img_off=new Image();  d_img_off.src="imgs/block/d-block.jpg"; 
 prep_img_on =new Image();  prep_img_on.src ="imgs/block/prep_on.jpg"; 
 prep_img_off=new Image();  prep_img_off.src="imgs/block/prep.jpg"; 
 
}

     //Images On
function handleOverA() {  
 if (document.images) document.a.src=a_img_on.src;
}

function handleOverB() { 
 if (document.images) document.b.src=b_img_on.src;
}
 
function handleOverC() {  
 if (document.images) document.c.src=c_img_on.src;
}

function handleOverD() {  
 if (document.images) document.d.src=d_img_on.src;
}

function handleOverPrep() {  
 if (document.images) document.prep.src=prep_img_on.src;
}

     //Images Off
function handleOutA() { 
 if (document.images) document.a.src=a_img_off.src;
}

function handleOutB() {
 if (document.images) document.b.src=b_img_off.src;
}

function handleOutC() { 
 if (document.images) document.c.src=c_img_off.src;
}

function handleOutD() { 
 if (document.images) document.d.src=d_img_off.src;
}

function handleOutPrep() { 
 if (document.images) document.prep.src=prep_img_off.src;
}

//-->