function storeCaret(text) { 
	if (text.createTextRange) {
		text.caretPos = document.selection.createRange().duplicate();
	}
}
function AddText(text) {
	if (document.book.obsah.createTextRange && document.book.obsah.caretPos) {      
		var caretPos = document.book.obsah.caretPos;      
		caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ?
		text + ' ' : text;
	}
	else document.book.obsah.value += text;
	document.book.obsah.focus(caretPos)
}
function showcolor(color) {
	AddTxt="[color="+color+"][/color]";
	AddText(AddTxt);
}
function starthelp(help) {
	document.book.helpbox.value = eval(help);
}

function createTarget(t){
	window.open("", t, "width=600,height=550");
	return true;
}
function restrictinput(maxlength,e,placeholder){
	if (window.event&&event.srcElement.value.length>=maxlength)
		return false
	else if (e.target&&e.target==eval(placeholder)&&e.target.value.length>=maxlength){
		var pressedkey=/[a-zA-Z0-9\.\,\/]/ 
		if (pressedkey.test(String.fromCharCode(e.which)))
			e.stopPropagation()
		}
}
function countlimit(maxlength,e,placeholder){
	var theform=eval(placeholder)
	var lengthleft=maxlength-theform.value.length
	var placeholderobj=document.all? document.all[placeholder] : document.getElementById(placeholder)
	if (window.event||e.target&&e.target==eval(placeholder)){
		if (lengthleft<0)
		theform.value=theform.value.substring(0,maxlength)
		placeholderobj.innerHTML=lengthleft
	}
}
function displaylimit(theform,thelimit){
	var limit_text='<b><span id="'+theform.toString()+'">'+thelimit+'</span></b>'
	if (document.all||ns6)
		document.write(limit_text)
	if (document.all){
		eval(theform).onkeypress=function(){ return restrictinput(thelimit,event,theform)}
		eval(theform).onkeyup=function(){ countlimit(thelimit,event,theform)}
	}
	else if (ns6){
		document.body.addEventListener('keypress', function(event) { restrictinput(thelimit,event,theform) }, true); 
	document.body.addEventListener('keyup', function(event) { countlimit(thelimit,event,theform) }, true); 
	}
}