button_0_on=new Image();button_0_on.src="img/button_profil_over.png";
button_0_off=new Image();button_0_off.src="img/button_profil.png";
button_0_click=new Image();button_0_click.src="img/button_profil_click.png";
button_1_on=new Image();button_1_on.src="img/button_work_over.png";
button_1_off=new Image();button_1_off.src="img/button_work.png";
button_1_click=new Image();button_1_click.src="img/button_work_click.png";
button_2_on=new Image();button_2_on.src="img/button_news_over.png";
button_2_off=new Image();button_2_off.src="img/button_news.png";
button_2_click=new Image();button_2_click.src="img/button_news_click.png";
button_3_on=new Image();button_3_on.src="img/button_links_over.png";
button_3_off=new Image();button_3_off.src="img/button_links.png";
button_3_click=new Image();button_3_click.src="img/button_links_click.png";
button_4_on=new Image();button_4_on.src="img/button_kontakt_over.png";
button_4_off=new Image();button_4_off.src="img/button_kontakt.png";
button_4_click=new Image();button_4_click.src="img/button_kontakt_click.png";

function changeImgSrc(imgNr, mode)
{
  if (document.images)
  {
    document.images[imgNr].src=eval('button_'+imgNr+'_'+mode+'.src');
  }
}