function respos(){ 
var browser=navigator.appName;
var b_version=navigator.appVersion;
var version=parseFloat(b_version);
if ((browser=="Microsoft Internet Explorer") && (version>=4)){

  //dynamicbutton.style.pixelLeft=document.body.scrollLeft + (screen.width/2) + 18;
  dynamicbutton.style.pixelLeft=document.body.scrollLeft + (document.body.clientWidth/2) - 160;
  //dynamicbutton.style.pixelRight=document.body.scrollRight;
  //dynamicbutton.style.pixelTop=document.body.scrollTop + 222;
  dynamicbutton.style.pixelTop=document.body.scrollTop+5;
  dynamicbutton.style.position='absolute';
}
else if(navigator.userAgent.toLowerCase().indexOf("opera") != -1)
{
  dynamicbutton.style.pixelLeft=(window.outerWidth/2) - 150;
  dynamicbutton.style.pixelTop=document.body.scrollTop+2;
  dynamicbutton.style.position='absolute';
}
else if( navigator.userAgent.toLowerCase().indexOf("firefox") != -1 || navigator.userAgent.toLowerCase().indexOf("chrome") != -1 )
{
  dynamicbutton.style.position='fixed';
  dynamicbutton.style.left=(window.outerWidth/2) - 150;
  dynamicbutton.style.top= '2px';
  //dynamicbutton.style.border="2px SOLID #000000"
}else
{
  dynamicbutton.style.pixelLeft=(window.outerWidth/2) - 150;
  dynamicbutton.style.pixelTop=document.body.scrollTop+2;
  dynamicbutton.style.position='fixed';
}

}
  
window.onscroll=respos;
respos();