function compareCBClick(cb){
	if(cb.checked){
		compareAdd(cb.value);
	}
	else{
		compareRemove(cb.value);
	}
}

function compareAdd(productId){
	
	if(!productId){
		alert('Morate izabrati proizvod!');
		return false;
	}
	
  new Ajax.Request('ajax_functions.php?action=compare_add&product_id=' + productId, {
                    asynchronous:true,
                    onComplete:function(req) {
	  									if (req.readyState == 4) {
	  										if (req.status == 200){
	  											var result = req.responseText;
	  											if(result != "OK"){
	  												alert(result);
	  												var cb = document.getElementById('compare_' + productId);
	  												if(cb) cb.checked = false;
													}
	  										}
	  									}
                    }
									}
	);
}

function compareRemove(productId){
	
	if(!productId){
		alert('Morate izabrati proizvod!');
		return false;
	}
	
  new Ajax.Request('ajax_functions.php?action=compare_remove&product_id=' + productId, {
                    asynchronous:true,
                    onComplete:function(req) {
	  									if (req.readyState == 4) {
	  										if (req.status == 200){
	  											//
	  										}
	  									}
                    }
									}
	);
}