Get a field value for html page?

I'm trying to set the value of an input on a popup html page onload using the value in a form field. But all i'm getting is this: "[object Object]"
 


code:

<script>
var timg = window.opener.$("#_fid_43");
 $("#imgurl").val(timg);
</script> 



I've tried a few different things, but end with that same result.
fid_43 is a Formula- Rich Text field that gives the image url for a record.

Any ideas how to get that URL into that input?