Check if div have touch another div

I Want To check if my div have touch another div

here is my Work

$(document).mousemove(function(event){
 if(getmouse){
 var newX= event.pageX-20;
 var newY= event.pageY-20;
 $('.mybox').css('left',newX + "px");
 $('.mybox').css('top',newY+ "px");
 var checkY = parseInt($('.box1').css('top').slice(0,-2));
 var checkX = parseInt($('.box1').css('left').slice(0,-2));
 var padingval = parseInt($('.box').css('padding').slice(0,-2))*2;
 console.log(checkY+padingval+" - "+newY);
 if((newY==checkY&&newX==checkX)||newY+20<checkY-padingval
 ||newY-20<checkY+padingval)
 {
 alert('Game Over');
 getmouse = false;
 $('.mybox').css('top',"240px");
 $('.mybox').css('left',"420px");
 }
 }
 })

//jsfiddle.net/48m6rof6

if My div Touch any div it Must alert Game over and return to its place I have checked if it touched first box but if there is any simple way to check ?