Tnx! That worked, now my problem is that I can't get the value from the selection made in the first VF page and show it in the second. I have been studying many examples, but I can't get it work in my code. Following is my code now:

Controller:

public with sharing class newTOPPController {
   

   // These four class variables maintain the state of the wizard. 
   
   // When users enter data into the wizard, their input is stored 
   
   // in these variables. 
  public String name;
  public Account acc;
  public Opportunity opportunity;
  public OpportunityContactRole role;
  public TOPP__c topp;
  public Integer ant = -1;
  public String cName = System.currentPageReference().getParameters().get('choosenName');//Try to fetch the selected value

public String getCName() //Return the fetched value
{
return cName;
}
   // The next four methods return one of each of the four class 
   
   // variables. If this is the first time the method is called, 
   
   // it creates an empty record for the variable. 
 
  public String getName() {
    return name;
  }

  public void setName(String n) {
    this.name = n;
  }

   public Integer getAntall()
   {
    return ant;
   }
   public void setAntall(Integer a)
   {
    this.ant = a;
   }
   public Account getAccount() {
      if(acc == null) acc = new Account();
      return acc;
   }
   public void setAccount(Account a)
   {
    acc = a;
   }
   public TOPP__c getTOPP() {
      if(topp == null) topp = new TOPP__c();
      return topp;
   }

   public Opportunity getOpportunity() {
      if(opportunity == null) opportunity = new Opportunity();
      return opportunity;
   }

   public OpportunityContactRole getRole() {
      if(role == null) role = new OpportunityContactRole();
      return role;
   }

   public List<SelectOption> getItems() {
    List<SelectOption> op = new List<SelectOption>();
    for(Account a : [SELECT Id, Name FROM Account]) op.add(new SelectOption(a.Id, a.Name));
    return op;
  }

   // The next three methods are used to control navigation through 
   
   // the wizard. Each returns a reference to one of the three pages 
   
   // in the wizard. 
   
   public PageReference step1() {
      return Page.TOPPCreator;
   }

   public PageReference step2() {
    return Page.TOPPIncomeExpenses;
  
 
   }

   public PageReference step3() {
      return Page.TOPPIncomeSecure;
   }
    public PageReference step4() {
      return Page.TOPPWealthDebt;
   }

   public PageReference step5() {
      return Page.TOPPSummary;
   }

   public PageReference step6() {
      return Page.TOPPCustomerAgreement;
   }

   // This method performs the final save for all objects  

   public PageReference save() {

    //I haven't anything here yet...

      return null;
   }
   

}

//CODE FOR VF 1

<apex:page controller="newTOPPController"  tabStyle="TOPP__c">
   <apex:sectionHeader title="Ny TOPP Gjennomgang"
                      subtitle="Steg 1 av 6"/>
<apex:form >
<apex:pageBlock title="Customer Information">

      <!-- This facet tag defines the "Next" button that appears
           in the footer of the pageBlock. It calls the step2()
           controller method, which returns a pageReference to
           the next step of the wizard. --> 
   
       <apex:pageBlockButtons location="top">
        <apex:commandButton action="{!step2}" value="Next"
                            styleClass="btn">
            <apex:param name="choosenName" value="{!name}">
            </apex:param>               
        </apex:commandButton>
                           
      </apex:pageBlockButtons>
      </apex:pageBlock>

    <apex:pageBlock title="Velge kunde">
     <apex:outputLabel >Kundenavn</apex:outputLabel>
      <apex:selectList value="{!name}" size="1" id="name">
        <apex:selectOptions value="{!items}"/>
      </apex:selectList>
     
                 
      
<apex:pageMessages />
    </apex:pageBlock>
</apex:form>

</apex:page>

//CODE FOR VF2

<apex:page controller="newTOPPController"  tabStyle="TOPP__c">
   <apex:sectionHeader title="Ny TOPP Gjennomgang"
                      subtitle="Steg 1 av 6"/>
<apex:form >
<apex:pageBlock title="Customer Information">

      <!-- This facet tag defines the "Next" button that appears
           in the footer of the pageBlock. It calls the step2()
           controller method, which returns a pageReference to
           the next step of the wizard. --> 
   
       <apex:pageBlockButtons location="top">
        <apex:commandButton action="{!step2}" value="Next"
                            styleClass="btn">
            <apex:param name="choosenName" value="{!name}">
            </apex:param>               
        </apex:commandButton>
                           
      </apex:pageBlockButtons>
      </apex:pageBlock>

    <apex:pageBlock title="Velge kunde">
     <apex:outputLabel >Kundenavn</apex:outputLabel>
      <apex:selectList value="{!name}" size="1" id="name">
        <apex:actionSupport event="onchange" rerender="name"/>
         <apex:selectOptions value="{!items}"/>
      </apex:selectList>
     
                 
      
<apex:pageMessages />
    </apex:pageBlock>
</apex:form>

</apex:page>