function detectNavigator()
		 {
			var browserIE=navigator.appName.indexOf('Microsoft');
			var browserO=navigator.appName.indexOf('Opera');
			var browserN=navigator.appName.indexOf('Netscape');
			var browserM=navigator.appName.indexOf('Mozilla');
			var OK=0;


			if (browserIE!=-1) OK=0;
			if (browserO!=-1) OK=0;
			if (browserN!=-1) OK=1;
			if (browserM!=-1) OK=1;

			return OK
		 }

function getWindowHeight()
  {
    var windowHeight=0;
    if (typeof(window.innerHeight)=='number')
      {
          windowHeight=window.innerHeight;
      }
    else
      {
      if (document.documentElement && document.documentElement.clientHeight)
        {
            windowHeight = document.documentElement.clientHeight;
        }
      else
        {
        if (document.body&&document.body.clientHeight)
            {
            windowHeight=document.body.clientHeight;
            }
        }
      }
    return windowHeight;
  }

function redimMarge()
		 {

		 var nav=detectNavigator();
		 if (nav==0)
		 		{

				if (document.body.clientWidth>750)
				   {
				   var largeur=(document.body.clientWidth-750)/2;
				   document.getElementById('gauche').width=largeur;
				   document.getElementById('droite').width=largeur;
				   }
				  else
				  {
				  document.getElementById('gauche').width=0;
				  document.getElementById('droite').width=0;

				  }


                                windowHeight = getWindowHeight();
                                if (windowHeight>541)
                                   {
                                   var hauteur=(windowHeight-541)/2;
				   document.getElementById('haut').height=hauteur;
				   document.getElementById('bas').height=hauteur;
				   }
				  else
				  {
				  document.getElementById('haut').height=0;
				  document.getElementById('bas').height=0;
				  }


				}

		if (nav==1)
			   {

			   if (window.innerWidth>750)
				   {
				   var largeur=(window.innerWidth-750)/2;
				   document.getElementById('gauche').width=largeur;
				   document.getElementById('droite').width=largeur;
				   }
				  else
				  {
				  document.getElementById('gauche').width="0";
				   document.getElementById('droite').width="0";

				  }

			   if (window.innerHeight>541)
				   {
				   var hauteur=(window.innerHeight-541)/2;

				   document.getElementById('haut').height=hauteur;
				   document.getElementById('bas').height=hauteur;
				   }
				  else
				  {
				  document.getElementById('haut').height="0";
				  document.getElementById('bas').height="0";

				  }

			   }
		 }


function affiche_expl(elem,zx,zy)
    {

    document.getElementById(elem).style.display='block';

    var x2=zx+'px';
    var y2=zy+'px';

//document.getElementById(elem).style.left='500px'
    document.getElementById(elem).style.top=y2;
    document.getElementById(elem).style.left=x2;


    }

function affiche_liens(elem,zx,zy)
    {
    var tx=0;
    var ty=0;
    tx=((zx/10)*10)+520;
    ty=((zy/10)*10)+380;

    document.getElementById(elem).style.display='block';
    var x2=tx+'px';
    var y2=ty+'px';

//document.getElementById(elem).style.left='500px'
    document.getElementById(elem).style.top=y2;
    document.getElementById(elem).style.left=x2;


    }

function affiche_story(elem,zx,zy)
    {
    var tx=0;
    var ty=0;
    tx=((zx/10)*10)+520;
    ty=((zy/10)*10)+20;

    document.getElementById(elem).style.display='block';
    var x2=tx+'px';
    var y2=ty+'px';

//document.getElementById(elem).style.left='500px'
    document.getElementById(elem).style.top=y2;
    document.getElementById(elem).style.left=x2;


    }

function cache_expl(elem)
    {
    document.getElementById(elem).style.display='none';


    }