gistfile1.txt

{!REQUIRESCRIPT("/soap/ajax/38.0/connection.js")} 
{!REQUIRESCRIPT("/soap/ajax/38.0/apex.js")} 
   var records = {!GETRECORDIDS($ObjectType.Employee__c)}; 
   var strIDs=''; 
    if (records[0] == null) { 
        alert('Please select a record'); 
    } 
    else { 
        for (var n=0; n<records.length; n++) { 
            if(strIDs == '') 
                strIDs = records[n]; 
            else 
                strIDs = strIDs + "," + records[n] ; 
         } 
         window.location.href = '/apex/MassManager__MassDelete?deleteIds='+strIDs + '&selectedObject=Employee__c&retURL='+ window.location.href; 
   }