var arrayObj = new Array();

function addItem(id){
    if (arrayObj.length == 3) {
        alert("至多比较三项产品");
        return;
    }
    if (!contain(id)){
        if (arrayObj.length < 3){
            arrayObj.push(id);
        }else{
            arrayObj.shift();
            arrayObj.push(id);
        }
        draw();
        document.getElementById("i"+id).filters.gray.enabled=true;
    }
}

function removeItem(index){
    if(document.getElementById("item"+index).innerHTML == "&nbsp;"){
        alert("没有可删除的项");
    }else{
        document.getElementById("i"+arrayObj[index-1]).filters.gray.enabled=false;
        remove(index);
        draw();
    }
}

function remove(index){
    arrayObj.splice(index-1,1);
}

function contain(key){
    var isContain = false;
    for(var i = 0;i<arrayObj.length;i++){
        if (key == arrayObj[i]){
            isContain = true;
            break;
        }
    }
    return isContain;
}

function draw(){
    clear();
    for(var i=1;i<=arrayObj.length;i++){
        document.getElementById("item"+i).innerHTML="<table><tr><td><img src=\""+document.getElementById("i"+arrayObj[i-1]).src+"\" width=\"104\" height=\"104\"></td></tr><tr><td align=\"center\">"+document.getElementById("ii"+arrayObj[i-1]).value+"</td></tr></table>";
    }
}

function clear(){
    for (var i=1;i<=3;i++){
        document.getElementById("item"+i).innerHTML="&nbsp;";
    }
}

function setForm(id){
//document.forms[0].action="pcresult.aspx?list="+arrayObj.join("-");
document.getElementById(id).value=arrayObj.join("-");
}