var spos = 0;
var epos = 880;
var sdirection = "forward";
var edirection = "forward";

function setpos(s,e){

  spos =s;
  epos =e;

}
/*
function startposL(){


       var nupos = spos;
       var S_but = document.getElementById('but');
       
       if(sdirection == "forward"){
       S_but.value=">";
       if(spos == 3344){sdirection = "back";S_but.value="<";}
       spos +=176;
       return nupos;
       }
       
       if(sdirection == "back"){
       S_but.value="<";
       if(spos == 176){sdirection = "forward";S_but.value=">";}
       spos -=176;
       return nupos;
       }
}

function endposL(){

       var nupos = epos;
       
       if(edirection == "forward"){
       if(epos == 3520){epos = 3168; nupos = 3520; edirection = "back";}
       epos +=176;
       return nupos;
       }
       
       if(edirection == "back"){
       if(epos == 0){epos = 352; nupos = 0; edirection = "forward";}
       epos -=176;
       return nupos;
       }

}
     */
     
function startposL(){


       var nupos = spos;
       var S_but = document.getElementById('but');

       if(sdirection == "forward"){
       S_but.value=">";

       if(spos == 2640){sdirection = "back";S_but.value="<";}
       spos +=880;
       return nupos;
       }

       if(sdirection == "back"){
       S_but.value="<";
       if(spos == 880){sdirection = "forward";S_but.value=">";}
       spos -=880;
       return nupos;
       }
}

function endposL(){

       var nupos = epos;

       if(edirection == "forward"){
       if(epos == 3520){epos = 1760; nupos = 3520; edirection = "back";}
       epos +=880;

       return nupos;
       }

       if(edirection == "back"){
       if(epos == 0){epos = 1760; nupos = 0; edirection = "forward";}
       epos -=880;
       return nupos;
       }

}


function myscroll_L(){
t1 = new Tween(document.getElementById('scroller'),'scrollLeft',Tween.strongEaseInOut,startposL(),endposL(),2,'');
t1.start();
}


function togglepic(){







}