function MakeImageArray(n) 
      		{
				if (document.images)
					{
              		this.length = n
              		for (var i=1; i<=n; i++) 
							{
                      this[i] = new Image()
                     }
              		return this
      			}
      		}
      		
function PreLoadImages()
      		{
      		if(document.images)
      				{
      				off = new MakeImageArray(8);
                	over = new MakeImageArray(8);
					
      				for (var i=1;i<=8; i++)
      						{
      						 off[i].src = "images/b"+i+"off.gif";
      						 over[i].src = "images/b"+i+"on.gif";
      						}	
      				}
     		 }		


function mover(num) 
       		{
                if (document.images) 
                	{
                   	document.images['b'+num].src = over[num].src;
                   	document.images['b1'+num].src = over[num].src;
                  	}
            }
            

function mout(num) 
       		{
                if (document.images)  
                	{
                  document.images['b'+num].src = off[num].src;
                   document.images['b1'+num].src = off[num].src;
                  }
                                    
        	   }