Question

Slide out is no problem i only have problem about slide in that doesnt show up and i think it didnt catch their first IF width equal 0px. sorry im really noobs about jQuery.

CODE:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
    $("#ShowHideComment").click(function(){
        if ($(".iframe_comment").width() == "0px"){
            $(".iframe_comment").animate({width: "800px"}, {queue:false, duration:1000});
        }
        else{
            $(".iframe_comment").animate({width: "0px"}, {queue:false, duration:1000
           });
        }
    });
});
</script>

Answer 1

From the docs:

All animated properties should be animated to a single numeric value

You’re not dealing with CSS property values here, but with plain integers.

$(document).ready(function(){
    $("#ShowHideComment").click(function(){
        var $comment = $(".iframe_comment");
        if ($comment.width() == 0){
            $comment.animate({width: 800}, {queue:false, duration:1000});
        }
        else{
            $comment.animate({width: 0}, {queue:false, duration:1000});
        }
    });
});

Also see width():

The difference between .css(width)
and .width() is that the latter
returns a unit-less pixel value