Clicking a custom button on CRM form 2011 and opening a new window.

Put this on the onload of form
function  buttonshow()
{
ConvertToButton('new_buttonfield', 'ButtonText','100px',FunctionName,'Button Label');
}
function ConvertToButton(fieldname, buttontext, buttonwidth,clickevent, title)
{
 //check if object exists; else return
  if (document.getElementById(fieldname) == null)
 {
   return;
  }

  functiontocall=clickevent;
  crmForm.all[fieldname].DataValue = buttontext;
  crmForm.all[fieldname].readOnly = true;
  crmForm.all[fieldname].style.borderRight="#3366cc 1px solid";
  crmForm.all[fieldname].style.paddingRight="5px";
  crmForm.all[fieldname].style.borderTop="#3366cc 1px solid";
  crmForm.all[fieldname].style.paddingLeft="5px";
  crmForm.all[fieldname].style.fontSize="11px";
  crmForm.all[fieldname].style.backgroundImage="url(/_imgs/btn_rest.gif)";
  crmForm.all[fieldname].style.borderLeft="#3366cc 1px solid";
  crmForm.all[fieldname].style.width=buttonwidth;
  crmForm.all[fieldname].style.cursor="hand";
  crmForm.all[fieldname].style.lineHeight="18px";
  crmForm.all[fieldname].style.borderBottom="#3366cc 1px solid";
  crmForm.all[fieldname].style.backgroundRepeat="repeat-x";
  crmForm.all[fieldname].style.fontFamily="Tahoma";
  crmForm.all[fieldname].style.height="20px";
  crmForm.all[fieldname].style.backgroundColor="#cee7ff";
  crmForm.all[fieldname].style.textAlign="center";
  crmForm.all[fieldname].style.overflow="hidden";
  crmForm.all[fieldname].attachEvent("onmousedown",push_button);
  crmForm.all[fieldname].attachEvent("onmouseup",release_button);
  crmForm.all[fieldname].attachEvent("onclick",functiontocall);
  crmForm.all[fieldname].style.lineHeight="14px";
  crmForm.all[fieldname+'_c'].style.visibility = 'hidden';
  crmForm.all[fieldname].title=title;
  window.focus();
 
 function push_button(){
   window.event.srcElement.style.borderWidth="2px";
   window.event.srcElement.style.borderStyle="groove ridge ridge groove";
   window.event.srcElement.style.borderColor="#3366cc #4080f0 #4080f0 #3366cc";
  }
 function release_button(){
   window.event.srcElement.style.border="1px solid #3366cc";
  }
 }

// now the definition of the function to call on button click
function FunctionName()
{
var url = "http://localhost/AIMSCRM/main.aspx?etc=10008&extraqs=%3f_gridType%3d10008%26etc%3d10008%26id%3d%257b1BEDD91A-05B8-E211-9851-1A4C5AE1EA24%257d%26pagemode%3diframe%26preloadcache%3d1368649807605%26rskey%3d480609602&pagetype=entityrecord";
 var name = "popup";
 var width = 800;
 var height = 600;
 var feature = "status=1";
 openStdWin(url, name, width, height, feature);
}