function randOrd()
{ return (Math.round(Math.random())-0.5); }

function pop_image(imgid)
{ thewindow = window.open('http://www.msserve.co.uk/heating/'+imgid+'.jpg','Image','width=660,height=510,border=no,toolbars=no,scrollbars=no,copyhistory=yes,status=no'); }


var image_array = new Array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37); 
var comment_array = new Array(
"",
"",
"",
"",
"",
"",
"",
"",
"", 
"", 
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
"",
""
); 

image_array.sort(randOrd); 
image_array.length = 5; 

var gap = "<br>"; 
document.write(gap); 
document.write(gap); 
document.write("<div style='width:160px'>"); 

for(i=0; i<image_array.length; i++)
{ 
document.write(gap); 
document.write("<a href='javascript:pop_image(" + image_array[i] + ")' class='link'>"); 
document.write("<img src='http://www.msserve.co.uk/heating/" + image_array[i] + ".jpg' width='160' border='0' alt='Click to enlarge'><br>"); 
document.write(comment_array[image_array[i] - 1]); 
document.write("</a><br>"); 
}

document.write("</div>");