var Drag={
    dragged:false,
    ao:null,
    tdiv:null,
    dragStart:function(){
		var evt = getEvent();
        Drag.ao = evt.srcElement;
        if(Drag.ao.tagName=="TD" || Drag.ao.tagName=="TR"){
            Drag.ao=Drag.ao.offsetParent;
            Drag.ao.style.zIndex=100;
        }
        else return;
        Drag.dragged = true;
        Drag.tdiv = document.createElement("div");
        Drag.tdiv.innerHTML = Drag.ao.outerHTML;
        Drag.ao.style.border = "1px dashed red";
        Drag.tdiv.style.display = "block";
        Drag.tdiv.style.position = "absolute";
        Drag.tdiv.style.filter = "alpha(opacity=70)";
        Drag.tdiv.style.cursor = "move";
        //Drag.tdiv.style.border = "1px solid #000000";
        Drag.tdiv.style.width = Drag.ao.offsetWidth;
        Drag.tdiv.style.height = Drag.ao.offsetHeight;
        Drag.tdiv.style.top = Drag.getInfo(Drag.ao).top;
        Drag.tdiv.style.left = Drag.getInfo(Drag.ao).left;
        document.body.appendChild(Drag.tdiv);
        Drag.lastX = evt.clientX;
        Drag.lastY = evt.clientY + getBodyScrollTop();
        Drag.lastLeft = Drag.tdiv.style.left;
        Drag.lastTop = Drag.tdiv.style.top;
    },

    draging:function(){ //重要:判断MOUSE的位置
		var evt = getEvent();
        if(!Drag.dragged || Drag.ao == null) return;
        var tX = evt.clientX;
        var tY = evt.clientY + getBodyScrollTop();
        Drag.tdiv.style.left = parseInt(Drag.lastLeft) + tX - Drag.lastX;
        Drag.tdiv.style.top = parseInt(Drag.lastTop) + tY - Drag.lastY;
        for(var i=0;i<parentTable.cells.length;i++){
            var parentCell = Drag.getInfo(parentTable.cells[i]);
            if(tX >= parentCell.left && tX <= parentCell.right && tY >= parentCell.top && tY <= parentCell.bottom){
                
                var subTables = parentTable.cells[i].getElementsByTagName("table");
                if (subTables.length == 0) {
                    if(tX >= parentCell.left && tX <= parentCell.right && tY >= parentCell.top && tY <= parentCell.bottom){
                        parentTable.cells[i].appendChild(Drag.ao);
                    }
                    break;
                }
                for(var j = 0; j < subTables.length; j++) {
                    var subTable = Drag.getInfo(subTables[j]);
                    if(tX >= subTable.left && tX <= subTable.right && tY >= subTable.top && tY <= subTable.bottom + 20){                        
                        parentTable.cells[i].insertBefore(Drag.ao,subTables[j]);
                        break;
                    }
                    else {
                        parentTable.cells[i].appendChild(Drag.ao);
                    }
                }
            }
        }
    },

    dragEnd:function(){
        if(!Drag.dragged) return;
        Drag.dragged = false;
        Drag.mm = Drag.repos(150,15);        
        Drag.ao.style.border = "#a9a9a9 1px solid";
        Drag.tdiv.style.borderWidth = "0px";
        Drag.ao.style.zIndex=1;
    },

    getInfo:function(o){//取得坐标
        var to=new Object();
        to.left=to.right=to.top=to.bottom=0;
        var twidth=o.offsetWidth;
        var theight=o.offsetHeight;
        while(o.tagName != "BODY" && o.tagName != "HTML"){
            to.left+=o.offsetLeft;
            to.top+=o.offsetTop;
            o=o.offsetParent;
        }
        to.right=to.left+twidth;
        to.bottom=to.top+theight;
        return to;
    },

    repos:function(aa,ab){
        var f=Drag.tdiv.filters.alpha.opacity;
        var tl=parseInt(Drag.getInfo(Drag.tdiv).left);
        var tt=parseInt(Drag.getInfo(Drag.tdiv).top);     
        var kl=(tl-Drag.getInfo(Drag.ao).left)/ab;
        var kt=(tt-Drag.getInfo(Drag.ao).top)/ab;
        var kf=f/ab;
        return setInterval(function(){
            if(ab<1) {
                clearInterval(Drag.mm);
                Drag.tdiv.removeNode(true);
                Drag.ao=null;
                return;
            }
            ab--;
            tl-=kl;
            tt-=kt;
            f-=kf;
            Drag.tdiv.style.left=parseInt(tl)+"px";
            Drag.tdiv.style.top=parseInt(tt)+"px";
            Drag.tdiv.filters.alpha.opacity=f;
        }
        ,aa/ab)
    },

    inint:function(){//初始化
        for(var i=0;i<parentTable.cells.length;i++){
            var subTables=parentTable.cells[i].getElementsByTagName("table");
            for(var j=0;j<subTables.length;j++){
                if(subTables[j].className!="dragTable") break;
                subTables[j].rows[0].className="dragTR";
                subTables[j].rows[0].attachEvent("onmousedown",Drag.dragStart);
            }
        }
        document.onmousemove=Drag.draging;
        document.onmouseup=Drag.dragEnd;
    }
}

// 获得事件Event对象，用于兼容IE和FireFox
function getEvent() {
	return (window.event || arguments.callee.caller.arguments[0]);
}

function _show(str){
    var w=window.open('','');
    var d=w.document;
    d.open();
    str=str.replace(/=(?!")(.*?)(?!")( |>)/g,"=\"$1\"$2");
    str=str.replace(/(<)(.*?)(>)/g,"<span style='color:red;'>&lt;$2&gt;</span><br />");
    str=str.replace(/\r/g,"<br />\n");
    d.write(str);
}

// 获得body的scrollTop,适应于IE5和IE6
function getBodyScrollTop() {
    if (typeof window.pageYOffset != 'undefined') { 
       return window.pageYOffset; 
    } 
    else if (typeof document.compatMode != 'undefined' && document.compatMode != 'BackCompat') { 
       return document.documentElement.scrollTop;   // IE6
    } 
    else if (typeof document.body != 'undefined') { 
       return document.body.scrollTop;              // IE5
    } 
}