function getkey(e){
if (window.event)
   return window.event.keyCode;
else if (e)
   return e.which;
else
   return null;
}
function is_num(e,z,m){
	k=getkey(e);
	return (((k>48)&&(k<(49+m)))||((k==48)&&(z==true))||(k==0)||(k==8));
}
function form_data(){
	data='';
	with(document.sform){
		for(i=0;i<elements.length;i++){
			if(elements[i].type!='button'){
				data+=elements[i].name+'='+elements[i].value+'&';
			}
		}
	}
	data+='time='+new Date().getTime();
	return data;
}
function sudokuAction(action){
	document.sform.action.value=action;
	document.getElementById('check_button').style.visibility='hidden';
	document.getElementById('solution_button').style.visibility='hidden';
	if(action=='load'){
		return loadData();
	}else if(action=='check'){
		return checkData();
	}else if (action=='solution'){
		return showSolution();
	}
	return false;
}
function loadData(){
    return !sendData(
       'GET',
       '/sudoku/load.php',
       form_data());
    return false;
 }
function checkData(){
	if(elType!='children_4x4'){
		var today=new Date();
		var date=new Date();
		date.setTime(today.getTime()+1000*60*60*24*365);
		document.cookie='player='+escape(document.sform.player.value)+"; path=/; expires="+date.toGMTString();
	}
	restoreInitialValues();
    return !sendData(
       'GET',
       '/sudoku/check.php',
       form_data());
    return false;
}
function restoreInitialValues(){
    document.sform.grid.value=s_grid;
    document.sform.level.value=s_level;
}
function showSolution(){
	restoreInitialValues();
    return !sendData(
       'GET',
       '/sudoku/solution.php',
       form_data());
    return false;
 }
 function sendData(method, url, data){
    var xmlhttp = getHTTPObject();
    if (!xmlhttp){
        return false;
    }
    if(method == "GET"){
     if(data == 'null'){
            xmlhttp.open("GET", url, true);
     }else{
            xmlhttp.open("GET", url+"?"+data, true);
     }
     xmlhttp.send(null);
    }else if(method == "POST"){
        xmlhttp.open("POST", url, true);
        xmlhttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
     xmlhttp.send(data);
    }
    return true;
 }
function getHTTPObject(){
  var xmlhttp = false;
  var NDC,NDR;
  /*@cc_on
  @if (@_jscript_version >= 5)
     try
     {
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
     }
     catch (e)
     {
        try
        {
           xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch (E)
        {
           xmlhttp = false;
        }
     }
  @else
     xmlhttp = false;
  @end @*/

  if (!xmlhttp && typeof XMLHttpRequest != 'undefined')
  {
     try
     {
        xmlhttp = new XMLHttpRequest();
     }
     catch (e)
     {
        xmlhttp = false;
     }
  }

  if (xmlhttp)
  {
     xmlhttp.onreadystatechange=function()
     {
        if (xmlhttp.readyState == 4) 
        {
           if (xmlhttp.status == 200) 
           {
    		  var i,j,elErrors,rowcol,startTime,elStatus,elAction,elSolution,solutions=new Array(),elEnum,elValues,valueTab=new Array(),hasError=false;
			  var grid_alert=new Array();
			  var pairs = xmlhttp.responseText.split("&");
              for(i=0;i<pairs.length;i++){
	              var pair = pairs[i].split("=");
	              if(pair[0]=='errors'){
					var elErrors=pair[1].split('_');
					for(j=0;j<elErrors.length;j++){
						rowcol=elErrors[j].split("-");
						grid_alert['r'+rowcol[0]+'c'+rowcol[1]]=1;
						grid_alert['r'+rowcol[2]+'c'+rowcol[3]]=1;
					}
	              }else if(pair[0]=='level'){
					s_level=pair[1];
	              }else if(pair[0]=='grid'){
					s_grid=pair[1];
	              }else if(pair[0]=='status'){
					elStatus=pair[1];
	              }else if(pair[0]=='action'){
					elAction=pair[1];
	              }else if(pair[0]=='solution'){
					elSolution=pair[1];
					solutions=elSolution.split("-");
	              }else if(pair[0]=='shaker'){
					elShaker=pair[1];
	              }else if(pair[0]=='start_time'){
					startTime=pair[1];
	              }else if(pair[0]=='type'){
					elType=pair[1];
					if(elType=='children_4x4'){
						NDR=4;
						NDC=4;
						success_alert='Well done ! You have completed the grid correctly !';
					}else{
						NDR=9;
						NDC=9;
						success_alert='Well done ! You have completed the grid correctly, and your score has been recorded !';
					}
	              }else if(pair[0]=='initial'){
					elInitial=unescape(pair[1]);
					initials=elInitial.split("-");
	              }
              }
   			  if(elAction=='load'){
   				document.sform.shaker.value=elShaker;
   				document.sform.start_time.value=startTime;
   			  }
			  document.getElementById('check_button').style.visibility=((elAction=='solution')||(elStatus=='completed')||(elStatus=='not_allowed') ? 'hidden' : 'inherit');
			  document.getElementById('solution_button').style.visibility=((elAction=='solution')||(elStatus=='completed')||(elStatus=='not_allowed') ? 'hidden' : 'inherit');
   			  if(elStatus=='not_allowed'){
   				alert('You\'re not allowed to display this grid number for the moment because you displayed it recently.');
   			  }else if(elStatus=='completed'){
   				alert(success_alert);
			  }else if(elStatus=='in_course'){
			    restoreInitialValues();
				if(elType=='classic_9x9'){
					document.getElementById('scores_link').href='sudoku/score-en-'+s_level+'-'+s_grid+'-1.html';
					document.getElementById('pdf_link1').href='sudoku/grid-'+s_level+'-'+s_grid+'.pdf';
					document.getElementById('pdf_link2').href='sudoku/grid-'+s_level+'-'+s_grid+'.pdf';
				}
				elTable=document.getElementById('sudokuGrid');
   				elEnum=0;
   				hasError=false;
				for(row=0;row<NDC;row++){
					for(col=0;col<NDR;col++){
						if(elAction=='check'){
							hasError|=(grid_alert['r'+row+'c'+col]==1);
							elTable.rows[row].cells[col].style.backgroundImage=(grid_alert['r'+row+'c'+col]==1 ? 'url(/img/red.gif)' : '');
						}else if(elAction=='solution'){
							part=solutions[elEnum].split(",");
							elTable.rows[row].cells[col].style.backgroundImage='';
							document.getElementById('r'+row+'c'+col).readOnly=true;
							document.getElementById('r'+row+'c'+col).style.fontWeight=(part[0]=='i' ? 'bold' : 'normal');
							document.getElementById('r'+row+'c'+col).value=part[1];
							elEnum++;
						}else if(elAction=='load'){
							elTable.rows[row].cells[col].style.backgroundImage='';
							document.getElementById('r'+row+'c'+col).readOnly=(initials[elEnum]!='0' ? true : false);
							document.getElementById('r'+row+'c'+col).style.fontWeight=(initials[elEnum]!='0' ? 'bold' : 'normal');
							document.getElementById('r'+row+'c'+col).value=(initials[elEnum]!='0' ? initials[elEnum] : '');
							elEnum++;
						}
					}
				}
				if(elAction=='check'){
					if(hasError){
						alert('Your grid contains some errors. They\'ve been marked in red.');
					}else{
						alert('Your grid has no error. Continue !');
					}
				}
			  }
           }
        }
     }
  }
  return xmlhttp;
}
var s_level;
var s_grid;
var elType;