function catchSelection()
{
    var selection = '';
    if (window.getSelection)
    {
	    selection = window.getSelection().toString();
    }
    else if (document.getSelection)
    {
	    selection = document.getSelection();
    }
    else if (document.selection)
    {
	    selection = document.selection.createRange().text;
    }
    return selection;
}