var cellName=null;
var imageDir="/ac/images/";

if(document.images)
   {
    var buttn_IMG_01_off = new Image();
    buttn_IMG_01_off.src = imageDir+"tab_01_off.gif"; 
    var buttn_IMG_01_on  = new Image();
    buttn_IMG_01_on.src  = imageDir+"tab_01_on.gif";

    var buttn_IMG_02_off = new Image();
    buttn_IMG_02_off.src = imageDir+"tab_02_off.gif";
    var buttn_IMG_02_on  = new Image();
    buttn_IMG_02_on.src  = imageDir+"tab_02_on.gif";

    var buttn_IMG_03_off = new Image();
    buttn_IMG_03_off.src = imageDir+"tab_03_off.gif"; 
    var buttn_IMG_03_on  = new Image();
    buttn_IMG_03_on.src  = imageDir+"tab_03_on.gif";

    var buttn_IMG_04_off = new Image();
    buttn_IMG_04_off.src = imageDir+"tab_04_off.gif"; 
    var buttn_IMG_04_on  = new Image();
    buttn_IMG_04_on.src  = imageDir+"tab_04_on.gif";
	
    var buttn_IMG_05_off = new Image();
    buttn_IMG_05_off.src = imageDir+"tab_05_off.gif"; 
    var buttn_IMG_05_on  = new Image();
    buttn_IMG_05_on.src  = imageDir+"tab_05_on.gif";
	
    var buttn_IMG_06_off = new Image();
	buttn_IMG_06_off.src = imageDir+"tab_06_off.gif"; 
    var buttn_IMG_06_on  = new Image();
    buttn_IMG_06_on.src  = imageDir+"tab_06_on.gif";
		
   }

function over(cellName) 
    {
     if(document.images) 
       {
        if(cellName == 'buttn1')
          {
           document[cellName].src = buttn_IMG_01_on.src;
          }
        if(cellName == 'buttn2')
          {
           document[cellName].src = buttn_IMG_02_on.src;
          }
        if(cellName == 'buttn3')
          {
           document[cellName].src = buttn_IMG_03_on.src;
          }
        if(cellName == 'buttn4')
          {
           document[cellName].src = buttn_IMG_04_on.src;
          }
        if(cellName == 'buttn5')
          {
           document[cellName].src = buttn_IMG_05_on.src;
          }
		if(cellName == 'buttn6')
          {
           document[cellName].src = buttn_IMG_06_on.src;
          }

       }

}

function out(cellName) 
    {
     if(document.images) 
       {
        if(cellName == 'buttn1')
          {
           document[cellName].src = buttn_IMG_01_off.src;
          }
        if(cellName == 'buttn2')
          {
           document[cellName].src = buttn_IMG_02_off.src;
          }
        if(cellName == 'buttn3')
          {
           document[cellName].src = buttn_IMG_03_off.src;
          }
        if(cellName == 'buttn4')
          {
           document[cellName].src = buttn_IMG_04_off.src;
          }
        if(cellName == 'buttn5')
          {
           document[cellName].src = buttn_IMG_05_off.src;
          }
        if(cellName == 'buttn6')
          {
           document[cellName].src = buttn_IMG_06_off.src;
          }

       }
    
    }