var selected=0; 
var selectedImg="";
function initImage(imgName,width,height)
{
 var img1=new Image(width,height);
 img1.src='./Images/'+imgName+'_on.jpg';
 var img2=new Image(width,height);
 img2.src='./Images/'+imgName+'_off.jpg';
};
function initSelection(imgName)
{
 selected=1;
 selectedImg = imgName;
};
function select(imgName)
{
 old_selectedImg=selectedImg; selectedImg=imgName;
 if(selected==0) selected=1;
 else inactallImg();
 actImg(imgName);
};
function actImg(imgName)
{
  document[imgName].src='./Images/'+imgName+'_on.jpg';
};
function inactImg(imgName)
{
 if(selectedImg!=imgName)
  document[imgName].src='./Images/'+imgName+'_off.jpg';
};
function inactallImg()
{
 for(var i=0; i<imgList.length; i++)
 	inactImg(imgList[i]);
};