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Divs too wide when hiding/showing

I have two divs that contain two other divs each. One containing DIV's display is set to none. I have a button that toggles the containing DIVs so I can alternately hide/show the containing div and thus the two divs inside. The inside DIVs are set the 49% width, floated left/right. Problem I have is the fist time the visible DIV is hidden and the hidden one displayed the inside two divs are way too wide. If I resize the width of the browser just a tiny bit with my mouse they are the desired size and any time I toggle the visibility from here on out all is fine. If I reload the page it is wrong on the first toggle. Works the same in IE 10 and Chrome so don't think a browser issue.
The inner two divs both contain high charts that are generated and rendered to the inner divs I want them to be side by side and almost (99%) the width of my page.
Here is snipped of my DIVs to be hidden and shown that contain the inner DIVs with highcharts
<div id="highChartsNG" style="width:99%;display:none;">
<div id="FillRateHigh" style="border:2px solid black;width:49%;float:left;"></div>
<div id="WaitTimeHigh"style="border:2px solid black;width:49%;float:right;"></div>
</div>
<div id="LowChartsPEAK" style="width:99%">
<div id="FillRateLow" style="border:2px solid black;width:49%;float:left;"></div>
<div id="WaitTimeLow"style="border:2px solid black;width:49%;float:right;" ></div>
</div>
This is a snippet of the javascript function I call on a button click to toggle on/off on the display of two containing DIVs
document.getElementById("highChartsNG").style.display = "none";
document.getElementById("LowChartsPEAK").style.display = "block";
Fiddle showing problem, see comment of mine below on how to reproduce http://jsfiddle.net/rplace/UTTz4/1/

Okay, after hours of searching I finally found the problem (I think). I was determined to find the solution =).
The problem is multiple-fold.
The first problem was the display:none; property on the second chartcontainer. For some reason the widths calculated for the charts and their containers were incorrect for the hidden div. So I removed the property from the HTML, and instead hid it dynamically with document.getElementById("LowChartsPEAK").style.display = "none"; in the JS right after the chart rendering functions. If you do this, your SVG's will fit your containers already, although the last one has a slight shift.
Apparently HighChart doesn't like percentage-based parent containers. When you go to your updated fiddle , run the fiddle with both:
<div id="wrapper" style="width: 800px;">
<div id="wrapper" style="width: 100%;">
Open the console and check the results (container name - SVG width - container width). When the wrapper is given a pixel width, all container widths are equal (as it should be). Now check the wrapper with percentage width: your last SVG will be about 6 to 20 pixels smaller. The only solution I have found for eliminating that small shift in the last container, is that somewhere a top container must have a pixel-width.
EDIT: pt's and em's also work. It's only % that causes problems

If you are hiding DIV, you should be aware that browser won't calculate %-based widths with display:none. Then if browser won;t calculate DIV, then also Highcharts are not able to do it ;)
Check this FAQ - when showing chart update his size or call reflow().

Dynamically generated “floating divs” with even width but not even heights, align issue

I will be very appreciative if anyone has a lead how to solve this:
Problem description:
we have Dynamically generated “floating divs” with even witdh but not even heights.(content based) .
the “Parent container” will have diffrent width parameters to allow 2,3,4 (in attached example 2 columns and 3 )divs to fits it’s width.
divs order is left to right, always by hirarchical order 1,2,3 etc...
How can we achieve this without creating gaps? ( casued by traditional floats method).
Number of divs is dynamically created and not limited...
Solution should be ie8,ie9 compatible
thanks, Jonathan. ![enter image description here][1]
example illustration can be found here:
https://app.box.com/s/6y89dlan1jt8bpjvcgb9

Have you considered using something like Masonry?

Pure CSS solution - Cross Browser (IE6+)
Use a column layout instead of floating.
This Working Fiddle demonstrate a 3 column layout, but you can easily change it to N column.
For a N Column Layout, you'll need to create N containers, each of 100/N width, and fill them accordingly.
You just have to build your dynamic content in the right order. (put the dynamic div in the right column each time).
Here's the basic HTML & CSS for the 3 column layout
<div class="Container">
</div>
<div class="Container">
</div>
<div class="Container">
</div>
.Container {
float: left;
width: 31.33%;
margin: 1%;
}
The script in the fiddle is for the sole purpose of adding dynamic content.
and although the content that I had have a fixed height, it will obviously work with changing heights as well.
BTW: for a 2 column layout, you Don't need this. just make the odd item float left, and the even items float right. Like This

How to automatically identify the appropriate space between divs

I was looking into ebay.com and the way that items are displayed (scroll down on the page and see div content the items boxes have different height)
<div id="content" class="content">
I am thinking of doing something similar but the problem that I am having is that somehow I need to cater for the spaces between each item because the divs will be generated automatically.
Can I do this with css (maybe grouping some items together and keep a margin / distance from each other automatically)?
Example fiddle here:

You can do it with CSS up to a certain level of quality, by floating elements;
after that, you must use JavaScript.
But you should really check out Masonry, because I guess it's exactly what you need.

You can use :first-child (or :last-child) to change the margin on the first or last element so you get neat spacing.

Hide child <div>s as parent div shrinks?

I am trying to write a zoom in/out feature on a web app I am making using the jqueryUI slider.
I am having difficulty handling when my parent div shrinks too much, and cramps its child containers.
<div class="puck originator inline-block" style="width: 310.5px; left: 0px;">
<div class="conflicted inline-block originator">
<div class="right-number">I should stay</div>
<div class="left-number">I should stay</div>
<div class="middle-number">I Should disapper</div>
</div>
</div>
Here is the relevant section of code I have
http://jsfiddle.net/aQKwE/
Basically I have the parent div (class 'puck') that is being shrunk using a jquery slider. For this code I just used a text box, but same idea.
When I shrink that div, the containing divs stick around and are very garbled.
I want to be able to remove the middle child div when it becomes to cramped, leaving the left and right child divs to occupy all the space
Furthermore, if it becomes to cramped yet after that, I want to remove the right div, leaving only the left.
Finally I want to be able to remove all contents so that nothing more than the background of the parent shows.
Is there a way to do this easily, preferably through CSS? I don't want to write more javascript code to set 'display:none' on each child div, since it seems like some CSS rules should handle this.
Any ideas?

There's not really any logic built into CSS to handle something like this. You can set rules based on viewport size, but that won't help in this case.
I updated your jsfiddle with this code so you can test it and see what you think, but essentially I just added some checks in your javascript function to hide based on the width submitted.
var newwidth = $('#text').val();
$(".middle-number").show();
$(".right-number").show();
if (newwidth < 280) {
$(".middle-number").hide();
}
if (newwidth < 180) {
$(".right-number").hide();
}
$('.puck').css('width',newwidth);

javascript div overlap

In my page am using effect.shrink().
While clicking fast the div tags are overlapping with other tags.
How do I solve this problem?
Am using scriptaculous.js and prototype.js

What do you have the duration of the effect set to? The default is 1.0 seconds. Try reducing this so the effect doesn't take so long and is able to complete before your next click.
Shrink
<div id="myDiv">
....
</div>

Set the padding of that div to 0, and use the inner elements to do the padding instead.