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    function insertAtCursor(myField, myValue)
    { 
        if (document.selection)
        { 
            myField.focus();
            sel = document.selection.createRange(); 
            sel.text = myValue; 
        }
        else if (myField.selectionStart || myField.selectionStart == "0")
        { 
            var startPos = myField.selectionStart;
            var endPos = myField.selectionEnd;
            myField.value = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
        }
        else
        { 
            myField.value += myValue; 
        }
    }


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