Setting the max-width and max-height for images: html

Setting the max-width and max-height for images

I have developed a forum. User are able to insert HTML tags directly. So user can paste a code like:

<img src="http://www.website.com/big_image.jpg" />

But I want to limit the max image size automatically, so it will not stretch out the fixed forum length if the image is larger, is that possible?

I have tried to use CSS

.container img {
max-width:500px;
max-height:500px;
}

but it seems like not working at all.

The image is not uploaded, so I can resize the image using PHP. Thank you.

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Javascript solution. See comments in code.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>	
<script type="text/javascript"><!--
 
window.onload = limitImages;
function setLimit(imgElem,prop,lim)
{
	for(var i=0,limit=document.images.length; i < limit; ++i)
	{
		if(imgElem==document.images[i])
		{
			if( lim < document.images[i][prop] )
			{
				imgElem[prop]=lim;
			}
			break;
		}
	}
}
function limitImages()
{
	var widthLimit=50;
	var heightLimit=50;
	var imgs = document.getElementsByTagName("img");
 
	for( var i=0, limit=imgs.length; i < limit; ++i)
	{
		if( -1 < imgs[i].parentNode.className.indexOf("container") )
		{
			setLimit(imgs[i],"width",50);
			setLimit(imgs[i],"height",50);
		}
	}
}
//--></script>
	
 
</head>
<body>
<!-- correct usage: the parent of img has a "container" class -->
<div class="container"><img src="http://www.cssnz.org/flower.jpg" alt=""></div>
<div class="container"><img src="http://www.missouriplants.com/Yellowopp/Helianthus_divaricatus_flowers.jpg" alt=""></div>
 
<!-- incorrect usage: the parent of the img tags is a div without a "container" class  -->
<p  class="container">
	<div>
		<img src="http://www.cssnz.org/flower.jpg" alt="">
		<img src="http://www.missouriplants.com/Yellowopp/Helianthus_divaricatus_flowers.jpg" alt="">
	</div>
</p>
</body>
</html>

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Setting the max-width and max-height for images

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