So right here:
"<div class='icone'><img src='http://icons-ak.wxug.com/i/c/k/"+wicon+".gif' alt='"+condition+"' title='"+condition+"'/></div>"
Change it to:
"<div class='icone'><img src='http://YourServer.com/yourIcons/"+ wicon +".gif' alt='"+condition+"' title='"+condition+"'/></div>"
And make sure you icons are named the same as they have.
Now, if you insist on having different names, you'll need to map their names to your names, which should be fairly trivial.