var popUpWin=0;
	function popUpWindow(URLStr,width, height)
	{
	  if(popUpWin)
	  {
	    if(!popUpWin.closed) popUpWin.close();
	  }
	  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbar=yes,resizable=yes,copyhistory=yes,width='+width+',height='+height+'');
	}
	
	
	function switchView(switchTo){
		if(switchTo == 'byDecision'){
			showLayer('byYear');
			hideLayer(switchTo);
			ln = document.getElementById("convention").options.length;
			for(i=0; i < ln; i++){document.getElementById("convention").options[i].selected = "";}
			document.getElementById("convention").multiple = false;
			document.getElementById("year1").selectedIndex = -1;
			document.getElementById("year2").selectedIndex = -1;
			document.getElementById("allBox").checked = false;
			hideLayer('yearsrch');
			showLayer('decsrch');
			}
		if((switchTo == 'byYear')||(switchTo == 'simple')||(switchTo == 'advanced')){
			showLayer('byDecision');
			hideLayer('byYear');
			document.getElementById("convention").multiple = true;
			clearDecVals();
			showLayer('yearsrch');
			hideLayer('decsrch');
				if(switchTo == 'simple'){
					var simplTerm = document.form1.searchTerm1.value;
				document.form1.reset();
				document.form1.searchTerm1.value = simplTerm;
				showLayer('simple');
				hideLayer('advanced');
				setSimple();
				return;
				}
				if(switchTo == 'advanced'){
				//document.form1.reset();
				showLayer('advanced');
				hideLayer('simple');
				setType();
				return;
				}
			}
		return;
	}

	function switchView2(switchTo){
			if(switchTo == 'simple'){
				var simplTerm = document.form1.searchTerm1.value;
			document.form1.reset();
			document.form1.searchTerm1.value = simplTerm;
			showLayer('simple');
			hideLayer('advanced');
			setSimple();
			return false;
			}
			if(switchTo == 'advanced'){
			//document.form1.reset();
			showLayer('advanced');
			hideLayer('simple');
			return false;
			}

		return;
	}

	function showLayer(id) {
		document.getElementById(id).style.display = "block";
		return;
	}
	
	function hideLayer(id) {
		document.getElementById(id).style.display = "none";
		return;
	}
	
  function setSimple()
  {
	document.form1.searchType.value = "simple";
	return;
  }
  
  function setType()
  {
  	document.form1.searchType.value = "advanced";
  	  
  	var year1 = 0;
  	var year2 = 0;
  	
  	if(document.getElementById("year1").selectedIndex != -1) year1 = document.getElementById("year1").options[document.getElementById("year1").selectedIndex].text;
  	if(document.getElementById("year2").selectedIndex != -1) year2 = document.getElementById("year2").options[document.getElementById("year2").selectedIndex].text;

  	if(year1 == 0 && year2 != 0)
  	{
  		document.getElementById("year1").selectedIndex = document.getElementById("year2").selectedIndex;
  		document.getElementById("year2").selectedIndex = -1;
  	}
	return;
  }
  
  function chkNum(ths1, ths2){
  	var tmp1 = 0;
  	var tmp2 = 0;
    	if((document.getElementById(ths1).value != "") && isNaN(parseInt(document.getElementById(ths1).value))){
    		document.getElementById(ths1).value = "";
    		alert('Please use integer values'); 
  			return false;
    	}
  		
  		if((document.getElementById(ths2).value != "") && isNaN(parseInt(document.getElementById(ths2).value))){
  			document.getElementById(ths2).value = "";
    		alert('Please use integer values'); 
  			return false;
  			}

 	if ((document.getElementById(ths1).value != "") && (document.getElementById(ths1).value != null)) tmp1 = parseInt(document.getElementById(ths1).value);
  	if ((document.getElementById(ths2).value != "") && (document.getElementById(ths2).value != null)) tmp2 = parseInt(document.getElementById(ths2).value);

  	if(tmp1 == 0 && tmp2 != 0)
  	{
  		document.getElementById(ths1).value = tmp2;
  		document.getElementById(ths2).value = "";
  		tmp1 = 0;
  		tmp2 = 0;
  	}
  }
  
  function clearDecVals(){
  	for(i=0;i < document.form1.elements.length; i++){
  	if(document.form1.elements[i].name.indexOf("_") == 0) {
		//alert('before: ' + document.form1.elements[i].name + ' is ' + document.form1.elements[i].value);
		document.form1.elements[i].value = null;
  	  	//alert('after: ' + document.form1.elements[i].value);
	}
  	}
  }
 
 function allTreaties(allBox){
 	if(allBox.checked){
 	for(i = 0; i < document.getElementById("convention").options.length; i++){
 		document.getElementById("convention").options[i].selected = true;
 	}}
 	else {
 		for(i = 0; i < document.getElementById("convention").options.length; i++){
 		document.getElementById("convention").selectedIndex = -1;
 		}
 	}
	return;
 }