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Usage
Create a form with name "select" and place a text area having its id as "testarea"
<form name="select">
<textarea id="testarea" rows="3" cols="40">
Just click on the button and get text area selected. Now press Ctrl+C to copy the text and paste it anywhere
</textarea>
Create a button with any name and call the function SelecText(testarea) by using onclick event.