var lasty=500;
var lastdiv=0;
var conx=0;
var cony=0;

function screenheight()
 {
 if(window.innerHeight)
  return window.innerHeight
 else if(document.body && document.body.offsetHeight)
  return document.body.offsetHeight
 else return 600;
 }

function screenwidth()
 {
 if(window.innerWidth)
  return window.innerWidth
 else if(document.body && document.body.offsetWidth)
  return document.body.offsetWidth
 else return 800;
 }

function menupos(mdiv,mx,my,ext)
 {
 for(var i=mdiv;i<=(mdiv+ext);i++)
  {
  position(i,mx,my);
  }
 }

function position(div,xk,yk)
 {
 // alert(div+' '+xk+' '+yk);
 width=eval(document.getElementsByTagName("div")[div].style.left.substr(0,document.getElementsByTagName("div")[div].style.left.length-2));
 document.getElementsByTagName("div")[div].style.left=eval(width+xk)+'px';
 height=eval(document.getElementsByTagName("div")[div].style.top.substr(0,document.getElementsByTagName("div")[div].style.top.length-2));
 document.getElementsByTagName("div")[div].style.top=eval(height+yk)+'px';
 lasty=yk;
 lastdiv=div;
 }