Trouble Passing Values Using onClick Event

I have a page with a div, <div id= PF_Text_Panel></>, containing text describing an image, the image is in a separate div. Using CSS the text panel is on top of the image and covers about 1/3 of the image’s left side. A slide effect, handled by the function Slide, targets the PF_Text_Panel div. The function Slide is triggered by an onClick event allowing the user to slide the description to the left and reveal the entire image.
The function Slide contains an if statement. The if statement is used to determine if PF_Text_Panel is open or closed using the variable SldPnlState as a flag like this; if the variable SldPnlState ==1, then run Slide. The other part of this function, which actually slides the div is an instance of the Slide Effect, inserted using Dreamweaver CS4.
The variable SldPnlState is set using the function setSldPnlState
The function setSldPnlState, initiated by an onClick, passes a value to the variable SldPnlState, in this case it can be set to either 0 or 1 by separate onClick events
To test if the variable SldPnlState is being passed from the onClick event to the variable I included the function printVar which writes the value of the variable SldPnlState to the screen.
I believe that the Spry effect Slide portion of the function works because if I go into the code and manually set the variable SldPnlState to 1 the function Slide works and if I set it to 0 the function Slide does not work.
This the bug:
printVar indicates that the value is being passed the variable SldPnlState, it displays either a 1 or 0 as expected.
The function Slide does not work however, when the variable SldPnlState should be set by the onClick event passing the value using the function setSldPnlState. It does not seem like the value is being passed from the onClick event triggering the function or that somehow the script stops running.
You can demo the page at: http://dg-ad.com/Slide_Effect_Logic_Parameter.html
Attached is the code, if anyone has some suggestions I would really appreciate hearing from you

<script src="SpryAssets/SpryEffects.js" type="text/javascript"></script>

<script language="javascript" type="text/javascript">

var SldPnlState = (1);
function setSldPnlState(flagToggle)
SldPnlState = flagToggle;
</script>


<script type="text/javascript">
if(SldPnlState==1)
function MM_effectSlide(targetElement, duration, from, to, toggle, transition, fps, horizontal)
Spry.Effect.DoSlide(targetElement, {duration: 500, from: 0, to: 200, toggle: true, transition: 2, fps: 750, horizontal: true});
//-->
</script>


<script type="text/javascript">
function printVar()
document.getElementById('test_display').innerHTML = SldPnlState
</script>

</head>
<body id="wrapper">
        <div style="padding-top:50px;">
        <a href="#" onclick="setSldPnlState(1);">Set var SldPnlState to Flag Status Set Open (1)</a><br><br><br>
        <a href="#" onclick="setSldPnlState(0);">Set var SldPnlState to Flag Status Set Closed (0)</a><br><br><br>
        <a href="#" onclick="printVar();">Print Flag Status to Screen</a><br><br><br>
        <div id="test_display" style="border:#9CC thick groove; width:50px; height:50px; margin:15px; text-align:center; font-size:36px;"></div>
        <a href="#" onclick="MM_effectSlide('PF_Text_Panel');">Slide Panel</a><br><br>
        </div>
<div id="PF_Text_Panel" style="border:#9C9 thick solid; height:250px; margin-top:25px;">
<div id="PF_Text" class="PF_Text">
</div>
<script type="text/javascript">
    var panelWidget_1=new Spry.Widget.HTMLPanel('PF_Text');
    </script>
</div>

Thanks so much for taking a look at this. The whole reason I am doing this is that I couldn't find a state indicator flag in the Spry.Effect.DoSlide effect.
I see that the htmlPanel does not have a bearing on the problem as you mentioned but not having the javascript doesn't matter either. I am using the Spry.Effect.DoSlide effect, it is in the head, in the function with the if statement, and it is making the div"PF_Text_Panel slide which works fine including the if statement. If I set the var SldPnlState = (1) it works set it to 0 and the slide effect is disabled. I need to be able to change the variable using an onclick event.
The problem as you mention is with the function SldPnlState = flagToggle; This is what I need to do. I need to pass a value to the variable SldPnlState from an onclick event. As the function Slide is set up, with an if statement, the div will slide if SldPnlState=1 and the slide function will turn off if SldPnlState=0. However when I do the onclick="setSldPnlState(1);"event there is no effect on the Slide function. The value seems to pass to the variable tSldPnlState since I can get the value of this same variable to display using the function printVar() which will display 1 or 0 depending on which onclick event I run. It seems like the I can pass the variable from the onclick event it's just that if statement in the function MM_effectSlide never sees it. I don't know enough to trouble shoot this. But I will take a closer look at the SldPnlState = flagToggle; part as you suggest.

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