hundon= new Image(131,31);
     hundon.src="images/M_ins_2_i.jpg";  
	 valpon= new Image(131,31);
     valpon.src="images/M_ins_3_i.jpg";  
	 gallerion= new Image(131,33);
     gallerion.src="images/M_ins_4_i.jpg";
     abouton= new Image(131,33);
     abouton.src="images/M_ins_5_i.jpg";   
	    
     hundoff= new Image(131,31);
     hundoff.src="images/M_ins_2.jpg";
     valpoff= new Image(131,31);
     valpoff.src="images/M_ins_3.jpg";  
	 gallerioff= new Image(131,33);
     gallerioff.src="images/M_ins_4.jpg";
     aboutoff= new Image(131,33);
     aboutoff.src="images/M_ins_5.jpg";   
	 
	 


function turnon(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }