Hi,
I wrote search functionality,In that i want to display no records found if a user gives value that have no records,this i want to display using javascript.not by pagemessages in controller.Below is the code.Please help me as I am new to java script.

VF:
---------------
<apex:page controller="searchwithactionstatuscontroller" id="one">
<script>
function js(val){

var inputValue = document.getElementById(val).value;

<!--var inputValue = document.getElementById('one:two:search').value;-->

if(inputValue.length <= 0){
alert('no records found');
}
else{
actionFunName(inputValue);
}
}
</script>
<apex:pageMessages />

<apex:form id="two">
 <apex:actionFunction name="actionFunName" action="{!searchpositions}"  reRender="two" />

<apex:outputLabel for="search" value="SEARCH :" style="font-weight:bold"   />
<apex:inputText value="{!search}"  id="search" onkeyup="js('{!$Component.search}')"   />
<!--<apex:inputText value="{!search}"  id="search" />-->
<!--<apex:actionSupport event="onkeyup" action="{!searchpositions}" reRender="two"/>-->

<apex:pageBlock rendered="{!blockOnLoad}" id="block1">
    <apex:pageBlockSection >
       <apex:pageBlockTable value="{!poslis}" var="pl"   >
         <apex:column value="{!pl.name}"/>
       </apex:pageBlockTable> 
    </apex:pageBlockSection>
</apex:pageBlock>

<apex:pageBlock rendered="{!blockOnEnter}" > 
    <apex:pageBlockSection id="d">
       <apex:pageBlockTable value="{!pos}" var="p"  >
         <apex:column value="{!p.name}"/>
         <apex:column >
         <apex:inputCheckbox value="{!p.name}"/>
         </apex:column>
       </apex:pageBlockTable>
    </apex:pageBlockSection>
 </apex:pageBlock> 
</apex:form>
</apex:page>

controller:
-------------
public with sharing class searchwithactionstatuscontroller {

    public String error { get; set; }
public boolean blockOnLoad{set;get;}
public boolean blockOnEnter{set;get;}


    public PageReference searchpositions() {
        string holdString ='SELECT name from Position__c  where name like  \'%'+search+'%\' ORDER BY name asc';
        pos=Database.query(holdString);
        
         blockOnLoad=false;
        blockOnEnter=true; 
        return null;
    }


    public String search { get; set; }

public List<position__c> poslis{set;get;}
public List<position__c> pos{set;get;}

public searchwithactionstatuscontroller() {
poslis=[select Name from position__c];
blockOnLoad=true;
blockOnEnter=false;
}

}

Thanks,
Mahanandeesh.