function tag(tag1,tag2)
{
	textarea = document.getElementById("textarea");
	// Code for IE
	if (document.selection)
	{
		textarea.focus();
		var sel = document.selection.createRange();
		sel.text = tag1 + sel.text + tag2;
	}
	else
	{  // Code for Mozilla Firefox
		var dl = textarea.value.length;
		var pocz = textarea.selectionStart;
		var koniec = textarea.selectionEnd;
		var scrollTop = textarea.scrollTop;
		var scrollLeft = textarea.scrollLeft;
		var sel = textarea.value.substring(pocz, koniec);
		var rep = tag1 + sel + tag2;
		textarea.value =  textarea.value.substring(0,pocz) + rep + textarea.value.substring(koniec,dl);
		textarea.scrollTop = scrollTop;
		textarea.scrollLeft = scrollLeft;
	}
}