I have a site that works on my machine but when I imported it into a webhosting environment. I get

'sys' is undefined, treeview_populatenode is undefined,

in tree.aspx, default.aspx, menu.aspx

What can the causes of this be and how can I fix? The problem is I don't have direct access to the server iis since it's hosted, and I need to go through some tech guy over email.