function changex(strid){
document.getElementById('plist_'+strid).src = "../images/p_listb.jpg";
}
function change(strid){
document.getElementById('plist_'+strid).src = "../images/p_lista.jpg";
}
//ͼƬ°´±ÈÀýËõ·Å 
var flag=false; 
function DrawImage(ImgD,iwidth,iheight){ 
var image=new Image(); 
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="ÏñËØ:"+image.width+"¡Á"+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="ÏñËØ:"+image.width+"¡Á"+image.height; 
} 
} 
} 
function changecolor(str,color){
str.style.background = color;
}