var flexElement;
/**
 * 功能：页面加载时执行此方法
 * @return flexElement
*/
function init(){
	//var f = parent.frmMainChild.document.getElementsByTagName("object")[0].id;
	//getmapSWF(f);//选择对象
	getmapSWF();
} 
/**
* 功能：地图标注相关方法
* iframe中调用
*/
function getmapSWF() {
	if (navigator.appName.indexOf("Microsoft") != -1) {
	     flexElement = parent.frmMainChild.document.getElementById('FlexProject');
	}else{
	     flexElement = parent.frmMainChild.document.getElementsByTagName("embed")[0];
 	}
	wheel(flexElement,afterwheel,true);
}	
/**
 * 获取用于标注地图的对象
 * 父页面调用
 */
function getSWF() {
	if (navigator.appName.indexOf("Microsoft") != -1) {
		flexElement = document.getElementById("frmMainChild").contentWindow.document.getElementById('FlexProject');
	}else{
		flexElement = document.getElementById("frmMainChild").contentWindow.document.getElementsByTagName("embed")[0];
	}
	wheel(flexElement,afterwheel,true);
	return flexElement;
}	

/**
 * 鼠标滚轮定点放大的方法
 * @param obj
 * @param fn
 * @param useCapture
 * @return
 */
function wheel(obj, fn ,useCapture){
	    var mousewheelevt=(/Firefox/i.test(navigator.userAgent))? "DOMMouseScroll" : "mousewheel" ;
		//FF doesn't recognize mousewheel as of FF3.x
	    if (obj.attachEvent) //if IE (and Opera depending on user setting)
	        obj.attachEvent("on"+mousewheelevt, handler, useCapture);
	    else if (obj.addEventListener) //WC3 browsers
	        obj.addEventListener(mousewheelevt, handler, useCapture);
	 
	    function handler(event) {
	        var delta = 0;
	        var event = window.event || event ;
	        var delta =  event.detail ?  -event.detail/3 : event.wheelDelta/120;
	        if (event.preventDefault)
	                    event.preventDefault();
	        event.returnValue = false;
	        return fn.apply(obj, [event, delta,obj]);
	    }
	}
   
function afterwheel(event, delta,obj){
    //这个是FLEX里写的放大缩小方法
	obj.WheelScroll(delta);
}
function changeLayers(layerI){
//	   alert(layerI);
	   if(layerI==1){
		  map.style.backgroundImage = "url(\"/nwyj/page/bin-release/assets/images/mapbg.jpg\")";
	   }else {
		  map.style.backgroundImage = "";
	   }
}