<!--
//图片按比例缩放
var flag=false;
function DrawImage(ImgD,widths,heights){
	var image=new Image();
	var iwidth = widths;  //定义允许图片宽度
	var iheight = heights;  //定义允许图片高度
	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;
		}
	}
} 
//调用：<img src="图片" onload="javascript:DrawImage(this,500,500)">



//文档内容文字大小调整
function doZoom(size)
{
document.getElementById('pzoom').style.fontSize=size+'px';
}


//双击页面自动滚动
var currentpos,timer; 

function initialize() 
{ 
timer=setInterval("scrollwindow()",60); 
} 
function sc(){ 
clearInterval(timer); 
} 
function scrollwindow() 
{ 
currentpos=document.body.scrollTop; 
window.scroll(0,++currentpos); 
if (currentpos != document.body.scrollTop) 
sc(); 
} 
document.onmousedown=sc 
document.ondblclick=initialize 


//-->

