// JavaScript Document

if (window.screen.availWidth>1200) { 
  x=800; //靠右X軸坐標
  x2=10;  //靠左X軸坐標
  y=50; 
 } 
else if (window.screen.availWidth>1000) { 
  x=757; //靠右X軸坐標
  x2=10;  //靠左X軸坐標
  y=16; 
 } 
else if (window.screen.availWidth<1000) { 
  x=900; //靠右X軸坐標
  x2=10;  //靠左X軸坐標
  y=0; 
 } 
else { 
  x=900; //靠右X軸坐標
  x2=10; //靠左X軸坐標
  y=70; 
 } 
div_y=0; 
distance=0; 
document.all['div1'].style.left=x+50;      // <--靠右
//document.getElementById("div1").style.left=x2;     // <--靠左
  
function stay(){ 
 var ny; 
 ny = y+document.documentElement.scrollTop; 
 distance=ny-div_y; 
 if(div_y!=ny){div_y+=(distance/10);} 
document.all['div1'].style.top=div_y;  // <---靠右 
//document.getElementById("div1").style.top=div_y-10;  // <---靠左 

} 
setInterval('stay()' , 1); //<--------------------- 啟動