var browserOK = false

function checkBrowser() {
  var verStr=navigator.appVersion, app=navigator.appName, version = parseFloat(verStr)

  if (app.indexOf('Netscape') != -1) {
    //  Netscape does not implement full CCS1 behaviors.
    //  if (version >= 4.0) browserOK = true
  } else if (app.indexOf('Microsoft') != -1) {
    if (version >= 4.0 || verStr.indexOf(4.0) != -1)
     browserOK = true
  }
}

var newTechPapersWindow

function launchTechPapers(pdf_file) {
var newAdobeDocumentWindow
if (!newTechPapersWindow || newTechPapersWindow.closed) {
    // create the adobereader window
    newTechPapersWindow = window.open(pdf_file,"TechPapers","status,menubar,scrollbars,resizable,width=750,height=280")

    // Create .opener property if necessary for old browsers.
    if (!newTechPapersWindow.opener) {
        newTechPapersWindow.opener = window
    }
} else {
	window.location = pdf_file;   
 // window's already open; bring to front
    newTechPapersWindow.focus()
    }
}