// squeezeFrame.js; standalone JS to solve small rendering issues that cause 
// content to be inaccessible or scrollbars to appear on iframes
//
// version: 201003221700
//
// author: frank -futtta- goossens
// License: CreativeCommons Attribution-Share Alike
//          (http://creativecommons.org/licenses/by-sa/3.0/) or
//          GNU LGPL (http://www.gnu.org/licenses/lgpl-3.0.txt)
// more info: http://blog.futtta.be/2010/03/24/
//
// usage: 
//      * include this script in the head of the iframe-content (i.e. in the 
//        page that is displayed inside the iframe)
//	* set "myContainer" to the URL of the iframe container page (i.e. the
//        page in which the iframe is created/ defined), to redirect users 
//        accessing the iframe-content out of context
//      * optionally set "myMax" with the maximum positive/negative zoom
//        allowed, e.g. 0.25 means that the page can zoom between 75 to 125%,
//        default is 0.10, so 90->110%
//	* optionally set "myRedraw" to "both" (default is "width") to adjust
//        to both width and height
//
// example code:
//	<script type="text/javascript" src="/path/to/squeezeFrame.js"></script>
//	<script type="text/javascript">
// 		myContainer="http://url.to/container-page/";
//	 	myMax=0.25;
//		myRedraw="width";
//	</script>
//
// bugs & issues:
//	* embedded YouTube in Firefox becomes invisible (but Vimeo for example 
//        does work)
// 	* the vertical scrollbar does not always disappear in FF
//	* does not work in Opera

window.onload=function() {
	if (self !== top) {
		if (typeof myMax!=="number") { max=0.1; } else { max=myMax;}
		if (typeof myRedraw!=="string") myRedraw="width";
		
		b=document.getElementsByTagName('body')[0];	

		zW=(b.clientWidth-5)/b.scrollWidth;
		
		if (myRedraw==="both") {
			zH=(b.clientHeight)/b.scrollHeight;
			if (zH<zW && zH < 1) { z=zH } else { z=zW };
			}
		else {
			z=zW;
			}
		
		if (z>1+max) { z=1+max; } else if (z<1-max) { z=1-max; }

		s="zoom:"+z+"; -moz-transform: scale("+z+"); -moz-transform-origin: 0 0;";

		if (typeof b.setAttribute === "function") b.setAttribute('style', s);
		else if (typeof b.style.setAttribute === "object") b.style.setAttribute('cssText', s);
	} else {
		if (typeof myContainer==="string") { window.location=myContainer; }
	}
}