function shiftBackground(){
  var doyle=document.getElementsByTagName("body");
  var bodie=doyle[0];
  var mf=browser.isIE?Math.round:Math.round;
  var xPos=mf((getViewportWidth()-781)/2)%5-(browser.isIE?3:2);
  bodie.style.backgroundPosition=xPos+"px 0";     

}



var initMenu=function(){
  var uls=getEl("head").getElementsByTagName("ul");

  for(var i=1;i<uls.length;i++){


	 if(browser.isOldIE){
		uls[i].parentNode.onmouseover=function(){
		  setVV(this.lastChild);
		}
	 }
	
	 uls[i].onmouseover=function(){
		this.parentNode.firstChild.className="act";
	 }
	 
	 uls[i].parentNode.onmouseout=function(){
		if(browser.isOldIE)setVH(this.lastChild);
		this.firstChild.className="";
	 }
  }
}




window.onresize=shiftBackground;


window.onload=function(){
  shiftBackground();
  initMenu();
};


function checkForm() {

	if(document.form.jmeno.value == '' || document.form.email.value == '' || document.form.kod.value == '') {
		alert('Vyplňte, prosím, všechna povinná pole!');
		return false;
	}

	if(document.form.kod.value !='KLmd14') {
		alert('Nesprávný kód!');
		return false;
	}

	return true;
}