[SalesForce] How to debug Javascript in Chrome on a Visualforce page

This works for me:

Controller:

public class MyController1{

public Boolean render1{get;set;}
public Boolean render2{get;set;}

public MyController1(ApexPages.StandardController controller) {
    render1 = true;
    render2 = false;
}

public MyController1(){
    render1 = true;
    render2 = false;
}


public void hide1Show2(){
    render1=false;
    render2=true;

}

public void hide2Show1(){
    render1=true;
    render2=false;
}

}

Page:

<apex:page controller="MyController1">
  <apex:form >
    <apex:pageBlock>
      <apex:pageBlockSection id="search">

        <apex:outputPanel id="thePanelWrapper1">
          <apex:outputPanel id="panel1" rendered="{!render1}" layout="block">
            <apex:commandLink action="{!hide1Show2}" value="show second"  reRender="thePanelWrapper1,thePanelWrapper2" />
          </apex:outputPanel>
        </apex:outputPanel>

        <apex:outputPanel id="thePanelWrapper2">
          <apex:outputPanel id="panel2" rendered="{!render2}" layout="block">
            <apex:commandLink action="{!hide2Show1}" value="show first"  reRender="thePanelWrapper1,thePanelWrapper2" />
          </apex:outputPanel>
        </apex:outputPanel>


    </apex:pageBlockSection>
  </apex:pageBlock>
</apex:form>

Anything that doesn't strictly evaluate to a native value should be enclosed in quotes, and you should also escape those values to avoid XSS injection attacks.

I would personally write the following code:

if({!OR(Lead.Custom_Status__c = '00', ISBLANK(Lead.Custom_Status__c))}) {

Salesforce will evaluate this to

if(true)

when the status is blank or set to 00, and

if(false)

otherwise.

Alternatively, if you want to use the value directly, make sure you use JSENCODE:

var customStatus = "{!JSENCODE(Lead.Custom_Status__c)}";
if(customStatus == "00" || !customStatus) {