function initPosition(textBox) 
    {
        var storedValue = textBox.value;
        textBox.value = "";
        textBox.select();

        var caretPos = document.selection.createRange();
        textBox.__boundingTop = caretPos.boundingTop;
        textBox.__boundingLeft = caretPos.boundingLeft;

        textBox.value = " ";
        textBox.select();

        caretPos = document.selection.createRange();
        textBox.__boundingWidth = caretPos.boundingWidth;
        textBox.__boundingHeight = caretPos.boundingHeight;

        textBox.value = storedValue;

    }

    function storePosition(textBox) 
    {
        var caretPos = document.selection.createRange();
        var boundingTop = (caretPos.offsetTop + textBox.scrollTop) - textBox.__boundingTop;
        var boundingLeft = (caretPos.offsetLeft + textBox.scrollLeft) - textBox.__boundingLeft;

        textBox.__Line = (boundingTop / textBox.__boundingHeight) + 1;
        textBox.__Column = (boundingLeft / textBox.__boundingWidth) + 1;

    } 

    function updatePosition(textBox) 
    {
        storePosition(textBox);
        document.forms[0].txtLine.value = textBox.__Line;
        document.forms[0].txtColumn.value = textBox.__Column;
    }
    
    function InsertText(textArea, valore)
    {
        if(document.selection) 
        { 
            textArea.focus(); 
            sel = document.selection.createRange(); 
            sel.text = valore; 
        } 
        else if(textArea.selectionStart) 
        { 
            var start = textArea.selectionStart; 
            var end = textArea.selectionEnd; 

            textArea.value = textArea.value.substr(0, start) 
            + valore 
            + textArea.value.substr(end, textArea.value.length); 

        }
    }