function Random(nMin,nMax)
{
   return(Math.floor((nMax-nMin+1) * Math.random() + nMin));
}
var gnBack=0;
var gaBColor=Array('TRO_headA-3','TRO_headB-3','TRO_headC-3','TRO_headD-3','TRO_headE-3','TRO_headF-4','TRO_headG-3');
var gaBImage=Array('TRO_headA-3','TRO_headB-3','TRO_headC-3','TRO_headD-3','TRO_headE-3','TRO_headF-4','TRO_headG-3');
gnBack=Random(0,gaBColor.length-1);