// JavaScript Document

function startMove(obj,json,fn){
		clearInterval(obj.timer);
		obj.timer = setInterval(function(){
		
			var bBtn = true;
		
			for(var attr in json){
			
				var iCur = 0;
				
				if(attr=='opacity'){
					iCur = Math.round(parseFloat(getStyle(obj,attr))*100);
				}
				else{
					iCur = parseInt(getStyle(obj,attr));
				}
				
				var iSpeed = (json[attr] - iCur)/8;
				iSpeed = iSpeed>0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
				
				if(json[attr]!=iCur){
					bBtn = false;
				}
				
				if(attr == 'opacity'){
					obj.style.filter = 'alpha(opacity='+(iCur+iSpeed)+')';
					obj.style.opacity = (iCur+iSpeed)/100;
				}
				else{
					obj.style[attr] = iCur+iSpeed + 'px';
				}
				
			
			}
			
			if(bBtn){
				clearInterval(obj.timer);
				
				if(fn){  //链式操作
					fn.call(obj);
				}
			}
		
		},30);
	}
	
	function getStyle(obj,attr){
		if(obj.currentStyle){
			return obj.currentStyle[attr];
		}
		else{
			return getComputedStyle(obj,false)[attr];
		}
	}