// kepcserelgeto
	////////////////
	
	function changeImages() {
	  if (document.images) {
		 for (var i = 0; i < changeImages.arguments.length; i += 2) {
			  document[changeImages.arguments[i]].src = changeImages.arguments[i + 1];
		 }
	  }
	}

	// kinyilo menu
	///////////////
	
	function Is() {
		  agent  = navigator.userAgent.toLowerCase();
		  this.major = parseInt(navigator.appVersion);
		  this.minor = parseFloat(navigator.appVersion);
		  this.ns    = ((agent.indexOf('mozilla')   !=   -1) &&
								 ((agent.indexOf('spoofer')   ==   -1) &&
								 (agent.indexOf('compatible') ==   -1)));
		  this.ns4   = (this.ns && (this.major      <=    4)&&
								 (this.minor                  <		5));
		  this.ns6    = (this.ns && (this.major     >=    5));
		  this.ie    = (agent.indexOf("msie")       !=   -1);
		  this.ie4   = (this.ie && (this.major      ==    4) &&
								 (agent.indexOf("msie 5.0")   ==   -1));
		  this.ie5   = (this.ie && (this.major      ==    4) &&
								 (agent.indexOf("msie 5.0")   !=   -1));
	}
	
	var is = new Is();
	
	if (is.ns4) {
		 doc = "document.";
		 sty = "";
	} else if (is.ie) {
		 doc = "document.all.";
		 sty = ".style";
	} else if (is.ns6) {
		 doc = "document";
		 sty = ".style";
		 htm = ""
		 xpos = "event.x";
		 ypos = "event.y";
	}
	
	function menu_nyito(layer) {
	
		 if (is.ns6) {
			  Menu_Object = eval(doc + ".getElementById(layer)" + sty);
		 } else {
			  Menu_Object = eval(doc + layer + sty);
		 }
	
		 if (eval(Menu_Object.visible)) {
			  clearTimeout(Menu_Object.hide);
		 }
		 Menu_Object.visibility = 'visible';
	
	}
	
	function menu_csuko(layer) {
	
		 if (is.ns6) {
			  Menu_Object = eval(doc + ".getElementById(layer)" + sty);
		 } else {
			  Menu_Object = eval(doc + layer + sty);
		 }
		 Menu_Object.visible = true;
		 menu_csuk(layer);
	
	}
	
	function menu_csuk(layer) {
	
		 if (is.ns6) {
			  Menu_Object = eval(doc + ".getElementById(layer)" + sty);
		 } else {
			  Menu_Object = eval(doc + layer + sty);
		 }
	
		 if (eval(Menu_Object.visible)) {
			  clearTimeout(Menu_Object.hide);
		 }
		 Menu_Object.visibility = 'hidden';
	
	}
	
	// regisztracio
	///////////////
	
	function chkMail(mail) {
		var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if (filter.test(mail)) {
			return true;
		} else {
			return false;
		}
	}