// JavaScript Document
function checkClick(msg){
	if(confirm(msg)){
		return event.returnValue=true;
	}else{
		return event.returnValue=false;
	}
}

function switchClass(obja){
	$(obja).mouseover(function(){
		if($(this).attr("class") != "hover"){
			$(this).addClass("hover");
		}
	}).mouseout(function(){
		$(this).removeClass("hover");
	})
}



function DrawImage(ImgD,iwidth,iheight){    
    //参数(图片,允许的宽度,允许的高度)    
    var image=new Image();    
     image.src=ImgD.src;    
    if(image.width>0 && image.height>0){    
      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;    
           }    
       }else{    
          if(image.height>iheight){      
               ImgD.height=iheight;    
               ImgD.width=(image.width*iheight)/image.height;            
           }else{    
               ImgD.width=image.width;      
               ImgD.height=image.height;    
           }    
       }    
     }    
}