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<HTML>
<HEAD>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<style>
*{margin:0;}
#main{
    background-image:url('http://clip2net.com/clip/m10494/1277192389-c-811b.png');
    width:660px;
    height:320px;
}
</style>
</HEAD>
<BODY><div id="main"></div></BODY>
</HTML>
​
 
var CELL_WIDTH=66;  //diamond area width
var CELL_HEIGHT=32;  //diamond area height
var activeCell=$("<img src=http://clip2net.com/clip/m10494/1277193046-block-698b.png>")
  .appendTo("#main")
  .css({"position": "absolute"});
​
$(function(){
    $("#main").mousemove(function(e){
        overCell(e.pageX,e.pageY);
   });  
});
​
//active diamond area
function overCell(x,y)
{ 
    //top left
    var f1 = -CELL_HEIGHT/CELL_WIDTH * (x%CELL_WIDTH) + CELL_HEIGHT/2;
    //bottom left
    var f2 =  CELL_HEIGHT/CELL_WIDTH * (x%CELL_WIDTH) + CELL_HEIGHT/2;
    //top right
    var f3 =  CELL_HEIGHT/CELL_WIDTH * (x%CELL_WIDTH) - CELL_HEIGHT/2;
    //bottom right
    var f4 = -CELL_HEIGHT/CELL_WIDTH * (x%CELL_WIDTH) + 3*CELL_HEIGHT/2;
​
    if (f1 > 0 && f1 < CELL_HEIGHT/2 && y%CELL_HEIGHT <= f1)
    {
        activeCell.css({ 
            "left":(x-x%CELL_WIDTH - CELL_WIDTH/2)+"px", 
            "top" :(y-y%CELL_HEIGHT - CELL_HEIGHT/2)+"px" 
        }); 
    }
    else if (f2 > CELL_HEIGHT/2 && f2 < CELL_HEIGHT && y%CELL_HEIGHT >= f2)
    {
        activeCell.css({ 
            "left":(x-x%CELL_WIDTH - CELL_WIDTH/2)+"px", 
            "top" :(y-y%CELL_HEIGHT + CELL_HEIGHT/2)+"px" 
        }); 
    }
    else if (f3 > 0 && f3 < CELL_HEIGHT/2 && y%CELL_HEIGHT <= f3)
    {
        activeCell.css({ 
            "left":(x-x%CELL_WIDTH + CELL_WIDTH/2)+"px", 
            "top" :(y-y%CELL_HEIGHT - CELL_HEIGHT/2)+"px" 
        }); 
    }
    else if (f4 < CELL_WIDTH/2 && f4 > CELL_WIDTH/4 && y%CELL_HEIGHT >= f4)
    {
        activeCell.css({ 
            "left":(x-x%CELL_WIDTH + CELL_WIDTH/2)+"px", 
            "top" :(y-y%CELL_HEIGHT + CELL_HEIGHT/2)+"px" 
        }); 
    }
    else
    {
        activeCell.css({ 
            "left":(x-x%CELL_WIDTH)+"px", 
            "top" :(y-y%CELL_HEIGHT)+"px" 
        });
    }
}
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