// 收缩展开效果
$(document).ready(function(){
   $(".proclass1").toggle(function(){
     $(this).next("#smallclass").animate({height: 'toggle', opacity: 'toggle'}, "slow");
   },function(){
	 $(this).next("#smallclass").animate({height: 'toggle', opacity: 'toggle'}, "slow");
   });
});
//图片切换
function switchPic(obj,url){
	document.getElementById(obj).src=url;
}

//图片按比例缩放

var flag=false;

function DrawImage(ImgD,ImgW,ImgH){

var image=new Image();

var iwidth =ImgW; //定义允许图片宽度，当宽度大于这个值时等比例缩小

var iheight =ImgH; //定义允许图片高度，当高度大于这个值时等比例缩小

image.src=ImgD.src;

if(image.width>0 && image.height>0){

flag=true;

if(image.width/image.height>= iwidth/iheight){

if(image.width>iwidth){ 

ImgD.width=iwidth;

ImgD.height=(image.height*iwidth)/image.width;

}else{

ImgD.width=image.width; 

ImgD.height=image.height;

}

ImgD.alt=image.width+"×"+image.height;

}

else{

if(image.height>iheight){ 

ImgD.height=iheight;

ImgD.width=(image.width*iheight)/image.height; 

}else{

ImgD.width=image.width; 

ImgD.height=image.height;

}

ImgD.alt=image.width+"×"+image.height;

}

}

}