function textarea_store_caret(obj) 
{ 
    if (obj.createTextRange) 
	obj.currRange = document.selection.createRange().duplicate(); 
}

function textarea_insert(obj, txt) 
{ 
    txt = "{{" + txt + "}}";
    if (obj.currRange) 
    { 
	obj.currRange.text = obj.currRange.text.charAt(obj.currRange.text.length - 1) != ' ' ? txt : 
	txt + ' '; 
	obj.currRange.select(); 
    } 
    else 
    {
	obj.value += txt; 
	if (obj.createTextRange) 
	{ 
	    var v = obj.value; 
	    var r = obj.createTextRange(); 
	    r.moveStart('character', v.length); 
	    r.select(); 
	} 
    }
} 

function textarea_insert_img(obj)
{
    path = window.prompt('Please specify the path of the image to insert', 'http://');

    if ((path != "") && (path != null))
    {
	textarea_insert(obj, "img:" + path);
    }
}