var pics;
var n = 0;
pics=new Array();

function preload(first,second){
   pics[n]=new Array(2);
   pics[n][0]=new Image();
   pics[n][0].src=first;
   pics[n][1]=new Image();
   pics[n][1].src=second;
   n++;
}

function on(name){
   document.images[name].src=pics[GetNum(name)][1].src;
}

function off(name){
   document.images[name].src=pics[GetNum(name)][0].src; 
}

function GetNum (name){
   if (name == 'a') { n= 0; }
   else if (name == 'b')  { n= 1; }
   else if (name == 'c')  { n= 2; }
   else if (name == 'd')  { n= 3; }

   else if (name == 'e')  { n= 4; }
   else if (name == 'f')  { n= 5; }
   else if (name == 'g')  { n= 6; }
   else if (name == 'h')  { n= 7; }
   else if (name == 'i')  { n= 8; }
   else if (name == 'j')  { n= 9; }
   else if (name == 'k')  { n= 10; }
   else if (name == 'l')  { n= 11; }
   else if (name == 'm')  { n= 12; }
   else if (name == 'n')  { n= 13; }
   else if (name == 'o')  { n= 14; }
   else if (name == 'p')  { n= 15; }
   return n;
}

preload("index_files/js_truffle_series.gif", "index_files/js_truffle_series1.gif");
preload("index_files/hcs_chocolate_truffles.gif", "index_files/hcs_chocolate_truffles1.gif");
preload("index_files/cs_chocolate_truffles.gif", "index_files/cs_chocolate_truffles1.gif");
preload("index_files/nkd_chocolate_truffles.gif", "index_files/nkd_chocolate_truffles1.gif");
preload("index_files/fruffles_truffles.gif", "index_files/fruffles_truffles1.gif");
preload("index_files/mc_chocolate_bars.gif", "index_files/mc_chocolate_bars1.gif");

preload("b2b4.gif", "b2b.gif");
preload("wp1.gif", "wp.gif");
preload("qbo2.gif","qbo1.gif");
preload("retail2.gif", "retail1.gif");
preload("wp4.gif", "wp2.gif");
preload("wc.gif", "wc1.gif");
preload("rs.gif", "rs1.gif");
preload("qb.gif", "qb1.gif");
preload("favp.gif", "favp1.gif");
preload("corp1.gif", "corp.gif");
//preload("", "");
//....