[SalesForce] Opening in a new window from visualforce page opens a blank window

I am trying to open standard page from a custom Visualforce Page through javascript using command button.But it reacts differently each time.It works properly sometimes.But in some cases it opens a blank window.

    <apex:outputPanel id="jspanel"> 
        <script>  
        function onControllerReturn() {
     window.open('{!message}','_blank');   

        }
        </script>
    </apex:outputPanel>
    <apex:actionFunction name="doControllerSave"    action="{!merged}" 
     oncomplete="onControllerReturn()" rerender="jspanel" />

<apex:commandButton onclick="doControllerSave()" value="Merge" rerender="none" style="background:#D3D3D3;width:150px;" status="loadStatus"/>

Message contains URL Parameter to be passed.

Class:

public PageReference Merged() {
    update ac1;

    string mergeURL = ''; 
    mergelst = new List<String> (); 
    for(Account a:selectedAccounts){ 
        // mergeURL=a.id; 
        System.debug('size of accounts'+mergeURL); 
        account maxvalue=selectedAccounts.get(selectedAccounts.size() - 1); string
        nextvalue=maxvalue.id; 
        System.debug('lastaccountid'+nextvalue);
        mergeURL +='&cid='+a.Id; // mergelst.add(mergeURL);

    }


    try { 
        message ='/merge/accmergewizard.jsp?goNext=+Next+'+mergeURL ;
    } catch(Exception e)
    { 
        ApexPages.addMessages(e); message = 'Whoops! An error occurred -- ' + e.getMessage(); 
    }
    return null;
}

Need Suggestions.Urgent..

Best Answer

message might get empty values sometimes. to get updated values on message variable. try this code.

Points to remember 1. script should be rerendered then you will get modified values from controller

<apex:outputpanel id="panel">
<script>
    function openNewWindow() {
        alert('{!url}');
    }
</script>
</apex:outputpanel>

Apex Class:

public class SectionExtension {
    public String url {get;set;}

    public SectionExtension(ApexPages.StandardController controller) {
        url = 'init val';
    }

    public Pagereference newWindow() {
        system.debug('##########');
        url = '/modified val';
        return null;
    }

}
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