document.getSelection
Is on the outer document. To get the selection of the document in the iframe you need to grab the inner document:
var iframe= document.getElementById('my');
var idoc= iframe.contentDocument || iframe.contentWindow.document; // ie compatibility
idoc.getSelection()
Note however that WebKit does not support document.getSelection() or document.selection. Try replacing it with window.getSelection() which works in both Firefox and WebKit, but returns a selection object (a collection/wrapper around Ranges), which needs stringing:
var idoc= iframe.contentDocument || iframe.contentWindow.document;
var iwin= iframe.contentWindow || iframe.contentDocument.defaultView;
''+iwin.getSelection()
I'm not sure what the point of this is:
if (window.RegExp) {
var regstr = unescape("%20%20%20%20%20");
var regexp = new RegExp(regstr, "g");
str = str.replace(regexp, "");
}
RegExp is basic JavaScript dating back to the very earliest version; it will always be there, you don't have to sniff for it. The URL-encoding of multiple spaces is quite unnecessary. You don't even need RegExp as such, a string replace could be written as:
str= str.split(' ').join('');
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