//图片按比例缩放 
var   flag=false; 
function   DrawImage(ImgD,MaxW, MaxH)
{ 
	var   image=new   Image(); 
	var   iwidth   =   MaxW;     //定义允许图片宽度 
	var   iheight   =   MaxH;     //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,133,100)"> 
//

function onlyNum() 
{ 
if(!(event.keyCode==46)&&!(event.keyCode==8)&&!(event.keyCode==37)&&!(event.keyCode==39)) 
if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105))) 
event.returnValue=false; 
}