Help removing ~ from an image URL

Hello everyone -

I have the following code in my transformation:

div class="CKcontentA" style="background-image: url('<%# Eval("ContentBG2") %>');background-repeat: no-repeat; background-size: 265px;"

It outputs the following HTML in the code:

div class="CKcontentA" style="background-image: url(' /getmedia/01126b60-b4de-478b-825c-14cca856be9d/REPLACETHIS.aspx?width=265&height=177&ext=.png');background-repeat: no-repeat; background-size: 265px;"

The ~ character is causing the image not to appear in the browser. When I've used almost identical code in other tags (such as an anchor tag) that character is not inserted and the image appears as a background to the DIV. Is there a way to phrase the initial call so as to exclude the ~ character?

EDIT: the forum seems to be stripping the tilde ~ out of the code example before the ~/getmedia