function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}	

function change_size(punkt) {
	document.getElementById('tresc').style.fontSize=punkt;	
	createCookie("textSize", punkt, 90);
}

function gr(co){	
	document.getElementById('cf1').style.backgroundImage="url(img/main_overlay2.png)";
	document.getElementById('cf2').style.backgroundImage="url(img/main_overlay2.png)";
	document.getElementById('cf3').style.backgroundImage="url(img/main_overlay2.png)";
	document.getElementById('gk1').style.display="none";
	document.getElementById('gk2').style.display="none";
	document.getElementById('gk3').style.display="none";	
	document.getElementById('cf'+co+'').style.backgroundImage="none";
	document.getElementById('gk'+co+'').style.display="block";
}

function tab1()
{
 document.getElementById('tab1').style.display='block';
 document.getElementById('tab2').style.display='none';
 document.getElementById('tab3').style.display='none';
 }
 
function tab2()
{
 document.getElementById('tab1').style.display='none';
 document.getElementById('tab2').style.display='block';
 document.getElementById('tab3').style.display='none';
 }
 
function tab3()
{
 document.getElementById('tab1').style.display='none';
 document.getElementById('tab2').style.display='none';
 document.getElementById('tab3').style.display='block';
 }