// JavaScript Document
function Pre_ChangeImage(imgobj,iPreImg_w,iPreImg_h){
var image=new Image();
var iwidth = iPreImg_w
var iheight = iPreImg_h
image.src=imgobj.src;
if(image.width>iwidth || image.height>iheight){
if(image.width>0 && image.height>0){
if(image.width/image.height>= iwidth/iheight){
if(image.width>iwidth){ 
imgobj.width=iwidth;
imgobj.height=(image.height*iwidth)/image.width;
}else{
imgobj.width=image.width; 
imgogj.height=image.height;
}
}
else{
if(image.height>iheight){ 
imgobj.height=iheight;
imgobj.width=(image.width*iheight)/image.height; 
}else{
imgobj.width=image.width; 
imgobj.height=image.height;
}
}
}
}else{imgobj.width=image.width; 
imgobj.height=image.height;
}
}