function precti(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function vytvor(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 zmena_vzhledu(){
switch(velikost_pisma) {
    case 1 : setActiveStyleSheet('Standardní verze s CSS'); vytvor("velikost","1","160");break;
    case 2 : setActiveStyleSheet('CSS + Pismo 2'); vytvor("velikost","2","160");break;
    case 3 : setActiveStyleSheet('CSS + Pismo 3'); vytvor("velikost","3","160");break;
    default : ;
}

}

function zvetsit_pismo(){ 
      if (velikost_pisma < 3){ 
      velikost_pisma = velikost_pisma + 1;
      }
      else velikost_pisma = 3;       
zmena_vzhledu();
}

function zmensit_pismo(){ 
      if (velikost_pisma > 1){
      velikost_pisma = velikost_pisma - 1;
      }
      else velikost_pisma = 1;
zmena_vzhledu();
}