var spqr = 'Press "OK", read it, then press "Back"'

// DynWrite(target, text) works on controls, after page load it is a computed function

// Classify browser
var nCheck = 0
DocDom = (document.getElementById?true:false) // NS6 also IE5
                                        if (DocDom) nCheck++
DocLay = (document.layers?true:false) ; if (DocLay) nCheck++  // NS4
DocAll = (document.all?true:false) ;    if (DocAll) nCheck++  // IE4

function ReportDocVars() {

 if (nCheck==0) document.write(' None of DocAll, DocLay, DocDom is set;',
                               ' Dynamic Write will fail.'.italics(), '<p>')
 if (DocAll) document.write(' DocAll is set. ')
 if (DocLay) document.write(' DocLay is set. ')
 if (DocDom) document.write(' DocDom is set. ')
 
}

function TableDocVars() {

 document.writeln('<br><br><table summary="Browser class info"',
  ' bgcolor=blue align=center cellpadding=10 border=4>',
  '<tr><th bgcolor=wheat>According to the displaying computer :<\/th>',
  '<\/tr><tr><td bgcolor=gainsboro align=center>',
  'Your browser gives<br>',
  '<b>DocAll = ', DocAll, ' ; DocDom = ', DocDom,
  ' ; DocLay = ', DocLay, '.<\/b><br>',
  'Check : ', nCheck, ' browser classification(s) set.',
  '<\/td><\/tr><\/table>')
  
}

// Define Function DynWrite(Where, What) to suit browser :
DocStr=''

if(DocLay) DocStr="return document.layers['NS_'+id]"
if(DocAll) DocStr="return document.all[id]"
if(DocDom) DocStr="return document.getElementById(id)"

GetRef=new Function("id", DocStr)

// DocLay = true ; DocAll = DocDom = false // Simulate NS4.7
DynWarn = 0

if(DocStr=='') { 

  DynWrite=new Function("return false") 
  
} 
else {

 if(DocAll || DocDom) {
   DynWrite=new Function("id", "S", "GetRef(id).innerHTML=S; return true")
 }

 if(DocLay) DynWrite=new Function(
  "if (0==DynWarn++)"+
  " alert('DynWrite not supported in \".layers\" browsers');"+
  "return false")
  
}

function NoDynLay() {

  if (DocLay) document.writeln(
  '<p><i>Dynamic Writing in a ".layers" browser ',
  'such as yours is difficult and I cannot now test it.  Therefore, ',
  'I don\'t now attempt it. An alert will be given in the first use in ',
  'each load/reload of a page.<\/i>') 
  
}