browser_name = navigator.appName; 
browser_version = parseFloat(navigator.appVersion); 

if (browser_name == "Netscape" && browser_version >= 3.0) { roll = 'true'; } 
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) { roll = 'true'; } 
else { roll = 'false'; } 

function over(a_img_index) 
{
  window.document.images[3+a_img_index].src = img_a[a_img_index*2+1]; 
} 


function set_img(a_img_index) 
{
  window.document.images[3+a_img_index].src = img_a[a_img_index*2]; 
} 

img_a=new Array()

img_a[0] =new Image;img_a[0] ='link1.gif'; 
img_a[1] =new Image;img_a[1] ='link1_wb.gif'; 

img_a[2] =new Image;img_a[2] ='link2.gif'; 
img_a[3] =new Image;img_a[3] ='link2_wb.gif'; 

img_a[4] =new Image;img_a[4] ='link3.gif'; 
img_a[5] =new Image;img_a[5] ='link3_wb.gif'; 

img_a[6] =new Image;img_a[6] ='link4.gif'; 
img_a[7] =new Image;img_a[7] ='link4_wb.gif'; 

img_a[8] =new Image;img_a[8] ='link5.gif'; 
img_a[9] =new Image;img_a[9] ='link5_wb.gif'; 

img_a[10]=new Image;img_a[10]='link6.gif'; 
img_a[11]=new Image;img_a[11]='link6_wb.gif';