// overmode 값
//     없으면 일반적인 롤오버
//     gray_color : 흑백상태에서 오버하면 칼라로. 원본이미지가 칼라일 것.
//     color_gray : 칼라상태에서 오버하면 흑백으로. 원본이미지가 칼라일 것.
//     overlay : 서로 겹쳐지며 변환
// oversrc : 변환될 이미지의 URL
//
// by 행복한고니

var gony_rollover_preImage = new Array;

function gony_rollover(){
        var i, len = document.images.length;
        var obj, overmode, oversrc;
        
        for(i = 0; i < len; i++){
                obj = document.images[i];
                overmode = obj.getAttribute('overmode');
                oversrc = obj.getAttribute('oversrc');

                switch(overmode){
                        case 'gray_color':
                                obj.style.filter = 'gray';
                                obj.onmouseover = new Function("this.style.filter=''");
                                obj.onmouseout = new Function("this.style.filter='gray'");
                                break;
                        case 'color_gray':
                                obj.onmouseover = new Function("this.style.filter='gray'");
                                obj.onmouseout = new Function("this.style.filter=''");
                                break;
                        case 'overlay':
                                if(oversrc){
                                        obj.style.filter = "blendTrans(duration=1)";
                                        obj.onmouseover = new Function("this.filters.blendTrans.Apply(); this.src='"+oversrc+"'; this.filters.blendTrans.Play()");
                                        obj.onmouseout = new Function("this.filters.blendTrans.Apply(); this.src='"+obj.src+"'; this.filters.blendTrans.Play()");
                                        gony_rollover_preImage[gony_rollover_preImage.length] = oversrc;
                                }
                                break;
                        default:
                                if(oversrc){
                                        obj.onmouseover = new Function("this.src='"+oversrc+"'");
                                        obj.onmouseout = new Function("this.src='"+obj.src+"'");
                                        gony_rollover_preImage[gony_rollover_preImage.length] = oversrc;
                                }
                }
        }
        gony_preload();
}
function gony_preload(){
        var i, len = gony_rollover_preImage.length;
        var image_object = new Image;

        for(i = 0; i < len; i++) image_object.src = gony_rollover_preImage[i];
}

window.onload = gony_rollover;