countMarks=4;
actM=1;

function clickMark(co){
	if(actM!=co){
		for(m=1; m<=countMarks; m++){
			document.getElementById('zal'+m).className = (co!=m) ? 'zal' : 'zal actzal';
			document.getElementById('det'+m).className = (co!=m) ? 'det' : 'det actdet';
		}
		actM=co;
	}
}