function onCompareSubmit(el, errMin, errMax) {
	var checked = 0;
	var ids = document.getElementsByName('ids[]');
	var i = ids.length;
	
	while(i--) {
		if(ids[i].checked)
			checked++;
	}
	
	if(checked < 1) {
		alert(errMin);
		return false;
	}
	
	if(checked > 3) {
		alert(errMax);
		return false;
	}
	
	return true;
}

function onCompareChange() {
	var checked = 0;
	var ids = document.getElementsByName('ids[]');
	
	var i = ids.length;
	while(i--) {
		if(ids[i].checked)
			checked++;
	}
	
	// Toggle status
	if(checked == 3) {
		var i = ids.length;
		while(i--) {
			if(ids[i].checked == false)
				ids[i].disabled = true;
		}		
	} else {
		var i = ids.length;
		while(i--) {
			ids[i].disabled = false;
		}	
	}
}