The textareas have an event handler:

 <textarea name="t" cols=50 rows='8' onselect="takeaway()">

The function "takeaway()" creates a text range for document.selection; stores it; and then clears the selection.

function takeaway(){
	word=document.selection.createRange().text;
	document.selection.clear();
	document.h.t.value+=word;
}