function random_imglink_main(images, alt, width, height){
  var ry=Math.floor(Math.random()*images.length)
  if (ry==0)
   ry=1;
   return '<img src="' + images[ry] + '" alt="' + alt + '" width="' + width +'" height="' + height + '" border="0">';
 }
 
var mainimage=new Array();
mainimage[1]='/images/main/main_01.jpg';
mainimage[2]='/images/main/main_02.jpg';
mainimage[3]='/images/main/main_03.jpg';
mainimage[4]='/images/main/main_04.jpg';
mainimage[5]='/images/main/main_05.jpg';
mainimage[6]='/images/main/main_06.jpg';


function random_imglink_environmental(images, alt, width, height){
  var ry=Math.floor(Math.random()*images.length)
  if (ry==0)
   ry=1;
   return '<img src="' + images[ry] + '" alt="' + alt + '" width="' + width +'" height="' + height + '" border="0">';
 }
 
var environmentalimage=new Array();
environmentalimage[1]='/images/environmental/environmental_pic1.gif';
environmentalimage[2]='/images/environmental/environmental_pic2.gif';
environmentalimage[3]='/images/environmental/environmental_pic3.gif';
environmentalimage[4]='/images/environmental/environmental_pic4.gif';
environmentalimage[5]='/images/environmental/environmental_pic5.gif';
environmentalimage[6]='/images/environmental/environmental_pic6.gif';
environmentalimage[7]='/images/environmental/environmental_pic7.gif';
environmentalimage[8]='/images/environmental/environmental_pic8.gif';