function ImgLoadic(img)
		{
			if( img.width > 150) img.width = 150;
			if( img.height > 150) img.height = 150;
			if( img.width < 150  && img.height > 150) img.width = 150;
		
		} 
		function imgFix(img) { 
		//定义要限制的图片宽高,这个宽高要同style里面定义的相同，小于限定高宽的图片不操作 
		var widthRestriction = 150; 
		var heightRestriction = 150; 
		var allElements = document.getElementsByTagName('*')   
		for (var i = 0; i < allElements.length; i++) 
		{ 
			if (allElements[i].className.indexOf(img) >= 0) 
				{ 
			var imgElements = allElements[i].getElementsByTagName('img'); 
			for (var j=0; j < imgElements.length; j++) 
				{ 
				if ( imgElements[j].width > widthRestriction || imgElements[j].height > heightRestriction ) 
						{ 
				if ( imgElements[j].width > imgElements[j].height) 
						{ 
					imgElements[j].height = imgElements[j].height*(widthRestriction/imgElements[j].width); 
					imgElements[j].width = widthRestriction; 
				} else 
						{ 
					imgElements[j].width = imgElements[j].width*(heightRestriction/imgElements[j].height); 
					imgElements[j].height = heightRestriction; 
				} 
				} 
						if ( imgElements[j].height < heightRestriction ) 
						{ 
						imgElements[j].style.paddingTop = ( heightRestriction -imgElements[j].height ) /2 + "px"; 
						} 
			} /*for j*/ 
			} 
		}/*for i*/ 
		} 
		window.onload = imgFix(img2); 
		window.onload = imgFix(img3);