The solution to your problem is VERY simple.
When coding i PHP the " is reserved for PHP and needs to be ESCAPED by putting a \ before it.
However, i have found a new solution which has worked every time for me. I just use a ' instead of a ". Some people say 16 year olds know nothing... well i worked that out. Here is your new code if you echo it it PHP. (echo just prints html to a page)
<script type='text/javascript'>
function openfeedbackwindow(strURL, pixW, pixH)
{
strLocation = strURL;
strWHandle = 'sdcSubWin';
strProps = 'resizable=yes,scrollbars=yes,toolbar=no,location=no,directories=no,status=no,menubar=no,width=' + pixW + ',height=' + pixH + ',top=15,left=15';
window.open(strLocation, strWHandle, strProps);
}
</script>
so just edit out all the "s and replace them with 's. Hope this has Helped (Give me a good Vote)