spaces in string passed to function

I have this popup window, and when you click on the a value in the popup it will call a function passing it the id and the name of the value you selected to send back to the opening window.

The problem is that the name of the value contains spaces and does not get passed to the function properly and thus errors out.

function looks like this(I am also using vb.net):

function sendback(strID, strName) {
window.opener.parent.frames[1].document.forms.txtID.value = strID;
window.opener.parent.frames[1].document.forms.txtName.value = strName;
window.close();
}

Now this works, on those that do not have spaces in their name.

Can anyone give me any suggestions or tell me what I am doing wrong.

Thanks.