var score=0;
    function chkans(e)
    {
      if(e.id.indexOf("l")!=-1)
      {
        divresult.innerHTML=divresult.innerHTML+"<font color='green'> "+e.title+".correct</font><br> ";
        score=score+1;
      }
      else
      {
        divresult.innerHTML=divresult.innerHTML+"<font color='red'>"+e.title+".wrong</font><br> ";
      }
      
      var nextdivid;
      if(parseInt(e.title)!=20)
      {
      document.getElementById("div"+e.title).disabled=true;
      document.getElementById(e.id).style.backgroundColor="yellow";
      nextdivid=parseInt(e.title)+1;
      document.getElementById("div"+nextdivid).disabled=false;
      }
      else
      {
      nextdivid=parseInt(e.title);
      document.getElementById("div"+nextdivid).disabled=true;
      document.getElementById(e.id).style.backgroundColor="yellow";
      divresult.innerHTML=divresult.innerHTML+"<br> You have scored <b>"+Math.round(score/20*100)+"%</b>";
      if(score==20)
      divresult.innerHTML=divresult.innerHTML+"<b><font color='blue'> Congratulations! Keep it up.....</font></b>";
      document.getElementById("divresult").style.display="block";
      document.getElementById("btnTry").style.display="block";
	  
      }
    }