1  var dragging = false;  2  var test;  3  var mouseY;  4  var mouseX;  5   6   window.onload = function()  7   {      8    test = document.getElementById("idname");  9    test.onmousedown = down; 10    test.onmousemove = move; 11    document.onmouseup = up; 12    test.style.position = "relative"; 13    test.style.top = "0px"; 14    test.style.left = "0px"; 15   } 16   17   function down(event) 18   { 19    event = event || window.event;  20    dragging = true;  21    mouseX = parseInt(event.clientX); 22    mouseY = parseInt(event.clientY); 23    objY = parseInt(test.style.top); 24    objX = parseInt(test.style.left); 25   } 26   function move(event) 27   { 28    event = event || window.event;  29    if(dragging == true) 30    {  31     var x,y;  32     y = event.clientY - mouseY + objY;  33     x = event.clientX - mouseX + objX;  34     test.style.top = y + "px";  35     test.style.left = x + "px"; 36    } 37   } 38   function up() 39   { 40    dragging = false; 41   }