// JavaScript Document
function rndImg(){
	var rnd=parseInt(Math.random()*15)+1;
	/*预载图片到数组
	var arrayImages = new Array();
	arrayImages = preloadimages("images/left_img/001.jpg","images/left_img/002.jpg","images/left_img/003.jpg");
	alert(arrayImages[rnd].src);
	document.getElementById("LeftImgArea").style.backgroundImage="url("+arrayImages[rnd].src+")";
	*/
	var imgName;
	if(rnd<=9){
		imgName="00" + rnd + ".jpg";
	}else if(rnd>9 && rnd <=99){
		imgName="0" + rnd + ".jpg";
	}
	document.getElementById("LeftImgArea").style.backgroundImage="url(/images/left_img/"+ imgName +")";
}


/*预载图片，并返回图片数组。*/
function preloadimages(){
	var arrayImages=new Array()
	for (i=0;i<preloadimages.arguments.length;i++){
		arrayImages[i]=new Image()
		arrayImages[i].src=preloadimages.arguments[i]
		//alert(arrayImages[i].src);
	}
	return arrayImages;
}

function ChangeText(_objName,_originText){
	var _obj = document.getElementById(_objName);
	if(_obj.value == _originText){
		_obj.value = "";
		} 
}

function SubmitTopSearch(){
	var _keyword = document.getElementById("keyword").value;
	if (_keyword == "搜索快餐…" || _keyword == "" ){
		alert("请输入搜索用的关键字!");
	}else{
		window.location.href='businessSearch.aspx?keyword=' + escape(_keyword);	
	}
}