if (document.images) 
{ 

button1off = new Image(); button1off.src = "/index_1.jpg"; button1on = new Image(); button1on.src = "/index_2.jpg"; 

button2off = new Image(); button2off.src = "/about_us_1.jpg"; button2on = new Image(); button2on.src = "/about_us_2.jpg"; 

button3off = new Image(); button3off.src = "/brand_1.jpg"; button3on = new Image(); button3on.src = "/brand_2.jpg"; 

button4off = new Image(); button4off.src = "/partners_1.jpg"; button4on = new Image(); button4on.src = "/partners_2.jpg"; 

button5off = new Image(); button5off.src = "/portfolio_1.jpg"; button5on = new Image(); button5on.src = "/portfolio_2.jpg"; 

button6off = new Image(); button6off.src = "/news_1.jpg"; button6on = new Image(); button6on.src = "/news_2.jpg"; 

button7off = new Image(); button7off.src = "/demo_1.jpg"; button7on = new Image(); button7on.src = "/demo_2.jpg"; 

button8off = new Image(); button8off.src = "/contacts_1.jpg"; button8on = new Image(); button8on.src = "/contacts_2.jpg"; 

button9off = new Image(); button9off.src = "/home_theater_1.jpg"; button9on = new Image(); button9on.src = "/home_theater_2.jpg"; 

button10off = new Image(); button10off.src = "/articles_1.jpg"; button10on = new Image(); button10on.src = "/articles_2.jpg"; 

button11off = new Image(); button11off.src = "/design_1.jpg"; button11on = new Image(); button11on.src = "/design_2.jpg"; 

button12off = new Image(); button12off.src = "/cert_1.jpg"; button12on = new Image(); button12on.src = "/cert_2.jpg"; 

} 

function On(imageName) 
{ if (document.images) 
  { document[imageName].src = eval(imageName+"on.src"); } 
} 
 
function Off(imageName) 
{ if (document.images) 
   { document[imageName].src = eval(imageName+"off.src"); } 
}