function changeSlide() {
  do { 
   randomNumber = Math.random()
   counterNo = Math.round( randomNumber * 10 )
  } while ( ( (counterNo < 0) || (counterNo > (slideshow.length - 1)) ) && counterNo != counterSlide) 
  counterSlide = counterNo
  document.slide.src = slideshow[counterSlide].src;
 }

 function changeCompany() {
  do { 
   randomNumber = Math.random()
   counterNo = Math.round( randomNumber * 10 )
  } while ( ( (counterNo < 0) || (counterNo > (companies.length - 1)) ) && counterNo != counterCompany) 
  counterCompany = counterNo
  document.company.src = companies[counterCompany].src;
 }

 var counterSlide = 0;
 var counterCompany = 0;
 var slideshow = new Array();
 var companies = new Array();
 
 slideshow[0] = new Image(); 
 slideshow[0].src = "images/slideshow/001.jpg";
 slideshow[1] = new Image(); 
 slideshow[1].src = "images/slideshow/002.jpg";
 slideshow[2] = new Image(); 
 slideshow[2].src = "images/slideshow/003.jpg";
 slideshow[3] = new Image(); 
 slideshow[3].src = "images/slideshow/004.jpg";
 slideshow[4] = new Image(); 
 slideshow[4].src = "images/slideshow/005.jpg";
 slideshow[5] = new Image(); 
 slideshow[5].src = "images/slideshow/006.jpg";
 slideshow[6] = new Image(); 
 slideshow[6].src = "images/slideshow/007.jpg";
 slideshow[7] = new Image(); 
 slideshow[7].src = "images/slideshow/008.jpg";

 companies[0] = new Image(); 
 companies[0].src = "images/companies/01_did.gif"; 
 companies[1] = new Image(); 
 companies[1].src = "images/companies/02_sds.gif";
 companies[2] = new Image(); 
 companies[2].src = "images/companies/03_yuasa.gif";
 companies[3] = new Image(); 
 companies[3].src = "images/companies/04_ngk.gif";
 companies[4] = new Image(); 
 companies[4].src = "images/companies/06_evolution.gif"; 
 companies[5] = new Image(); 
 companies[5].src = "images/companies/07_bertoni.gif";  
 // companies[4] = new Image(); 
 // companies[4].src = "images/companies/002.gif";

 window.setInterval("changeCompany()", 5000);
 window.setInterval("changeSlide()", 7000);