function makeRequest(url) {
	var http_request = false;
	if (window.XMLHttpRequest) { // Mozilla, Safari, ...
	http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/xml');
		}
	} 
	else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e) {
			try {
			http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (e) {}
		}
	}
	if (!http_request) {
		return false;
	}
	http_request.open('GET', url, true);
	http_request.send(null);
	return http_request;
}

function showLoader(bool){
    if(bool==true){
        document.getElementById('loader_bg').style.display='block';
        document.getElementById('loader').style.display='block';
    }
    else{
        document.getElementById('loader_bg').style.display='none';
        document.getElementById('loader').style.display='none';
    }
}

function addToCard(id, price){
	request=makeRequest('/cart/actions.php?addtocard=y&id='+id+'&price='+price+'&js=y');
	showLoader(true);
	request.onreadystatechange = function(){
        if (request.readyState == 4) {
    		if (request.status == 200) {
    			document.getElementById('total_sum').innerHTML=request.responseText;
    			showLoader(false);
    			return false;
    		} 
    		else {
                showLoader(false);
    			return false;
    		}
    	}
    	else{
            //showLoader(false);
        }
    }
	return false;
}

function delFromCard(id){
	request=makeRequest('/cart/actions.php?delfromcard=y&id='+id+'&js=y');
	showLoader(true);
	request.onreadystatechange = function() {
        if (request.readyState == 4) {
    		if (request.status == 200) {
    			document.getElementById('basket').innerHTML=request.responseText;
    			document.getElementById('total_sum').innerHTML=document.getElementById('tobasket').innerHTML;
    			showLoader(false);
    			return false;
    		} 
    		else {
                showLoader(false);
    			return false;
    		}
    	}
    	else{
            //showLoader(false);
        }
    }
	return false;
}
function changeNumCard(id,dif){
	request=makeRequest('/cart/actions.php?changenum=y&id='+id+'&dif='+dif+'&js=y');
	showLoader(true);
	request.onreadystatechange = function() {
        if (request.readyState == 4) {
    		if (request.status == 200) {
    			document.getElementById('basket').innerHTML=request.responseText;
    			document.getElementById('total_sum').innerHTML=document.getElementById('tobasket').innerHTML;
    			showLoader(false);
    			return false;
    		} 
    		else {
                showLoader(false);
    			return false;
    		}
    	}
    	else{
            //showLoader(false);
        }
    }
	return false;
}


function clearCard(){
	request=makeRequest('/cart/actions.php?clearcard=y&js=y');
	showLoader(true);
	request.onreadystatechange = function() {
        if (request.readyState == 4) {
    		if (request.status == 200) {
    			document.getElementById('basket').innerHTML=request.responseText;
    			document.getElementById('total_sum').innerHTML=document.getElementById('tobasket').innerHTML;
    			showLoader(false);
    			return false;
    		} 
    		else {
                showLoader(false);
    			return false;
    		}
    	}
    	else{
            //showLoader(false);
        }
    }
	return false;
}