function COUNTmessage(open,closed) {
var opening = document.hop.message.value.split(open);
var closing = document.hop.message.value.split(closed);
return opening.length + closing.length - 2;
}

function AJOUTmessage(var1,var2) {
var ta = document.getElementById('message');

	if (document.selection) {
	var str = document.selection.createRange().text;
	ta.focus();
	var sel = document.selection.createRange();
		if (var2!="") {
			if (str=="") {
			var instances = COUNTmessage(var1,var2);
				if (instances%2 != 0) { sel.text = sel.text + var2; }
				else { sel.text = sel.text + var1; }
			}
			else { sel.text = var1 + sel.text + var2; }
		}
		else { sel.text = sel.text + var1; }
	}
	else if (ta.selectionStart | ta.selectionStart == 0) {
		if (ta.selectionEnd > ta.value.length) { ta.selectionEnd = ta.value.length; }
	var firstPos = ta.selectionStart;
	var secondPos = ta.selectionEnd+var1.length;
	ta.value=ta.value.slice(0,firstPos)+var1+ta.value.slice(firstPos);
	ta.value=ta.value.slice(0,secondPos)+var2+ta.value.slice(secondPos);
	ta.selectionStart = firstPos+var1.length;
	ta.selectionEnd = secondPos;
	ta.focus();
	}
	else {
	var sel = document.hop.message;
	var instances = COUNTmessage(var1,var2);
		if (instances%2 != 0 && var2 != ""){ sel.value = sel.value + var2; }
		else{ sel.value = sel.value + var1; }
	}
}