<div class="content left">
<div class="post">
Дата публикацiи: [[*publishedon]]"
<h2 class="postTitle">[[*pagetitle]]</h2>
<img class="mainImage" alt="" src="[[*image:phpthumbof=`w=120&h=120&zc=1`]]" style='float:left;margin:7px 7px 0 0;'>
[[*content]]
</div>
</div>
This question has been answered by zwhzwh. See the first response.

Are you sure you have the right chunk/template?Yes, I'm sure because I've changed a number in the picture's style and now it's different in the page's HTML, too.
In the source it says while in the chunk/template there isn't.
That call doesn't look wrong.
Maybe you need [[+image:phpthumbof... if you use getresources?
<div class="content left">
<div class="post">
Дата публикацiи: [[*publishedon]]"
<h2 class="postTitle">[[*pagetitle]]</h2>
<img class="mainImage" alt="" src="[[*image:phpthumbof=`w=120&h=120&zc=1`]]" style='float:left;margin:7px 6px 0 0;'>
[[*content]]
</div>
</div>
</img>, my Firefox must add it itself -- maybe for its own satisfaction.
<p class="summary"><img src="[[+tv.image:phpthumbof=`w=100`]]" style='float:left;margin:7px 7px 0 0;' width=100> [[+introtext]]</p>
<p class="summary"><img src="[[+tv.image:phpthumbof=`w=100`]]" style=[b]"[/b]float:left;margin:7px 7px 0 0;[b]"[/b] width=[b]"[/b]100[b]"[/b]> [[+introtext]]</p>
Hmmm... Surely, keeping all styles in a CSS file is some better but, frankly speaking, I didn't understand what these letters "b" in brackets mean. They look like the tags of the bold font type but in brackets, but I'm sure your idea was different... If I did it myself, I'd simply replace the option "style" with an option "class", with this class described in a CSS file.<p class="summary"><img src="[[+tv.image:phpthumbof=`w=100`]]" style="[b]"[/b]float:left;margin:7px" 7px="" 0="" 0;[b]"[="" b]="" width="[b]"[/b]100[b]"[/b]"> [[+introtext]]</p>
Some correction to your tpl. However, you may want to look at making the layout adjustment and style changes in your CSS rather than you template. This way you can assign a class="img-intro" and keep layout to the CSS file rather than in-line. Just a suggestion.
The problem is solved! I must have put down the size of the picture in HTML, too:
<p class="summary"><img src="[[+tv.image:phpthumbof=`w=100`]]" style="float:left;margin:7px 7px 0 0;" width="100"> [[+introtext]]</p>
well, I guess that putting all styles into a CSS file is better but in this case I wanted simply to solve the problem ASAP for a test site. I hope there's no difference in how it works between typing class='...' and discribing it in a CSS file and typing directly style='...'?
i don´t think this solve the problem, maybe now you see the image 100px width because you are forcing this size, right click on the image ( in the browser ) and see the source image, there you will see the real size.
You should specify all visual styles in css, that´s what css is for.
If you´re using getresources you must use the "+" sign, so instead of "[[*pagetitle]]" you should use "[[+pagetitle]]", if it´s a template variable, you must put the "tv" prefix, so [[+tv.image]], and enable tvs and process tvs in the getResources call.
It´s all here: http://rtfm.modx.com/extras/revo/getresources
Hope this helps.
Sebastián.