Resizeable iframe

In iframe

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script type="text/javascript">
	//http://www.onlineaspect.com/2010/01/15/backwards-compatible-postmessage/
	var RUAXD = function () {

		var interval_id,
		last_hash,
		cache_bust = 1,
		attached_callback,
		window = this;

		return {
			postMessage: function (message, target_url, target) {
				if (!target_url) {
					return;
				}
				target = target || parent;  // default to parent
				if (window['postMessage']) {
					// the browser supports window.postMessage, so call it with a targetOrigin
					// set appropriately, based on the target_url parameter.
					target['postMessage'](message, target_url.replace(/([^:]+:\/\/[^\/]+).*/, '$1'));
				} else if (target_url) {
					// the browser does not support window.postMessage, so use the window.location.hash fragment hack
					target.location = target_url.replace(/#.*$/, '') + '#' + (+new Date) + (cache_bust++) + '&' + message;
				}
			},
			receiveMessage: function (callback, source_origin) {
				// browser supports window.postMessage
				if (window['postMessage']) {
					// bind the callback to the actual event associated with window.postMessage
					if (callback) {
						attached_callback = function (e) {
							if ((typeof source_origin === 'string' && e.origin !== source_origin)
					|| (Object.prototype.toString.call(source_origin) === "[object Function]" && source_origin(e.origin) === !1)) {
								return !1;
							}
							callback(e);
						};
					}
					if (window['addEventListener']) {
						window[callback ? 'addEventListener' : 'removeEventListener']('message', attached_callback, !1);
					} else {
						window[callback ? 'attachEvent' : 'detachEvent']('onmessage', attached_callback);
					}
				} else {
					// a polling loop is started & callback is called whenever the location.hash changes
					interval_id && clearInterval(interval_id);
					interval_id = null;
					if (callback) {
						interval_id = setInterval(function () {
							var hash = document.location.hash,
					 re = /^#?\d+&/;
							if (hash !== last_hash && re.test(hash)) {
								last_hash = hash;
								callback({ data: hash.replace(re, '') });
							}
						}, 100);
					}
				}
			}
		};
	}();
</script>
<script type="text/javascript">
	var parent_url = decodeURIComponent(document.location.hash.replace(/^#/, ''));
	function send(msg) {
		RUAXD.postMessage(msg, parent_url, parent);
		return false;
	}
</script>
<script type="text/javascript">
	jQuery(document).ready(function ($) {
		//alert($('body').height() + ' hash: ' + window.location.hash);
		send($('body').height());
	});
</script>

Notice that jQuery is actualy not nessesary for this script.

Parent

<iframe id="RUAFRAME" allowTransparency="1" frameborder="0" scrolling="no" src="http://local.rabota.ua/export/context/company.aspx?ntid=1074" style="width:100%;border:none;"></iframe>
<script type="text/javascript">
var RUAXD = function(){

    var interval_id,
    last_hash,
    cache_bust = 1,
    attached_callback,
    window = this;

    return {
        postMessage : function(message, target_url, target) {
            if (!target_url) {
                return;
            }
            target = target || parent;  // default to parent
            if (window['postMessage']) {
                // the browser supports window.postMessage, so call it with a targetOrigin
                // set appropriately, based on the target_url parameter.
                target['postMessage'](message, target_url.replace( /([^:]+:\/\/[^\/]+).*/, '$1'));
            } else if (target_url) {
                // the browser does not support window.postMessage, so use the window.location.hash fragment hack
                target.location = target_url.replace(/#.*$/, '') + '#' + (+new Date) + (cache_bust++) + '&' + message;
            }
        },
        receiveMessage : function(callback, source_origin) {
            // browser supports window.postMessage
            if (window['postMessage']) {
                // bind the callback to the actual event associated with window.postMessage
                if (callback) {
                    attached_callback = function(e) {
                        if ((typeof source_origin === 'string' && e.origin !== source_origin)
                        || (Object.prototype.toString.call(source_origin) === "[object Function]" && source_origin(e.origin) === !1)) {
                             return !1;
                         }
                         callback(e);
                     };
                 }
                 if (window['addEventListener']) {
                     window[callback ? 'addEventListener' : 'removeEventListener']('message', attached_callback, !1);
                 } else {
                     window[callback ? 'attachEvent' : 'detachEvent']('onmessage', attached_callback);
                 }
             } else {
                 // a polling loop is started & callback is called whenever the location.hash changes
                 interval_id && clearInterval(interval_id);
                 interval_id = null;
                 if (callback) {
                     interval_id = setInterval(function() {
                         var hash = document.location.hash,
                         re = /^#?\d+&/;
                         if (hash !== last_hash && re.test(hash)) {
                             last_hash = hash;
                             callback({data: hash.replace(re, '')});
                         }
                     }, 100);
                 }
             }
         }
    };
}();

var RUADOMAIN = document.getElementById('RUAFRAME').src.replace('http://', '').split('/').shift();
document.getElementById('RUAFRAME').src = document.getElementById('RUAFRAME').src + '#' + encodeURIComponent(document.location.href);

RUAXD.receiveMessage(function(message){
	document.getElementById('RUAFRAME').style.height = parseInt(message.data) + 'px';
	//alert(message.data + ' parent');
}, 'http://' + RUADOMAIN);
</script>

Script cant send messages in both directions, between differrent domains.

Found at: http://www.onlineaspect.com/2010/01/15/backwards-compatible-postmessage/

Example: http://onlineaspect.com/uploads/postmessage/parent.html