// JavaScript Document
function insertTag(tag, id)
{ 

	if(document.selection)
	{
	var range = document.selection.createRange();
    var str = range.text;
    if(tag=="a")
    {
    var my_link = prompt("Vložte URL:","http://");
    if (my_link != null) {
    range.text = "<a href=\"" + my_link + "\">" + str + "</a>";
    }
    }
    else
    range.text = "<"+tag+">" + str + "</"+tag+">";
	}
	else
	{
		var v = window.document.getElementById(id);
		var st = v.value.substring(0,v.selectionStart);
    var middle = v.value.substring(v.selectionStart,v.selectionEnd);
		var end = v.value.substring(v.selectionEnd,v.value.length);
		if(tag=="a")
    {
    var my_link = prompt("Vložte URL:","http://");
    if (my_link != null) {
    v.value = st + "<a href=\"" + my_link + "\">" + middle + "</a>" + end;
    }
    }
    else
		v.value = st + "<"+tag+">" + middle + "</"+tag+">" + end;
	}
}