VF page

<apex:page Controller="Assignmentnew">
<apex:panelGrid columns="2">
<apex:form id="all" >
<apex:pageBlock >
<apex:pageBlockButtons location="top" >
<apex:commandButton value="new" action="{!doNewrecord}"/>
</apex:pageBlockButtons>
<apex:pageBlockTable value="{!accList}" var="a">
<apex:column headerValue="Name">
<apex:outputLink value="/{!a.id}/d?retURL=/apex/AssignmentNew">
{!a.name}
</apex:outputLink>
</apex:column>
<apex:column headerValue="Buttons">
<apex:outputLink value="/{!a.id}/e?retURL=/apex/{!a.Name}">
Edit
</apex:outputLink>
<apex:commandLink action="{!delAccount}" reRender="all">Del
<apex:param value="{!a.Id}" assignTo="{!SelectedAccountId} "/>
</apex:commandLink >
</apex:column>
</apex:pageBlockTable>
</apex:pageBlock>
</apex:form>
</apex:panelGrid>
</apex:page>

Class ::

public class Assignmentnew
{

public List<Account> accList {get; set;}
public string SelectedAccountId {get; set;}

public Assignmentnew()
{
setupAccount();
}

public void setupAccount()
{
accList = [Select name, id from Account ];
}

public Pagereference doNewrecord()
{
Pagereference newRecord= new Pagereference ('/001/e?retURL=/001/');
return newRecord;
}

public PageReference delAccount()
{
accList = [select id,name from account where id=:SelectedAccountId];
if(accList .size() > 0 || accList[0].Id != ''){
delete accList;
}
setupAccount();
return null;
}

}

Error:

List index out of bounds: 0

An unexpected error has occurred. Your development organization has been notified.

Can anyone help me with this code.

Thanks

Ishan