/////////////////////////////////////////////////////////////
//
//  GLOBAL JAVASCRIPT FUNCTIONS
//
/////////////////////////////////////////////////////////////

function chkBrowser()
{
	var detect = navigator.userAgent.toLowerCase();
	if (checkIt('msie', detect))
	{
		return "block";
	}
	else
	{
		return "table-row";
	}
}	

function checkIt(string, detect)
{
	place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}


//  toggle a layer display

function toggleLayer(whichLayer)
{
	var useCSS = chkBrowser();

	useItem = window.document.getElementById(whichLayer).style.display;

	if ( ("block" == useItem) || ("table-row" == useItem) || ("" == useItem))
	{

		window.document.getElementById(whichLayer).style.display = 'none';
	}
	else
	{
		window.document.getElementById(whichLayer).style.display = useCSS;
	}
}

	function emailCheck (emailStr)
	{

		var checkTLD=1;
		var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
		var emailPat=/^(.+)@(.+)$/;
		var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
		var validChars="\[^\\s" + specialChars + "\]";
		var quotedUser="(\"[^\"]*\")";
		var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
		var atom=validChars + '+';
		var word="(" + atom + "|" + quotedUser + ")";
		var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
		var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

		var matchArray=emailStr.match(emailPat);

		if (matchArray==null)
		{
			//alert("Email address seems incorrect (check @ and .'s)");
			return false;
		}

		var user=matchArray[1];
		var domain=matchArray[2];

		for (i=0; i<user.length; i++)
		{
			if (user.charCodeAt(i)>127)
			{
				//alert("Ths username contains invalid characters.");
				return false;
			}
		}

		for (i=0; i<domain.length; i++)
		{
			if (domain.charCodeAt(i)>127)
			{
				//alert("Ths domain name contains invalid characters.");
				return false;
			}
		}

		if (user.match(userPat)==null)
		{
			//alert("The username doesn't seem to be valid.");
			return false;
		}

		var IPArray=domain.match(ipDomainPat);
		if (IPArray!=null)
		{
			for (var i=1;i<=4;i++)
			{
				if (IPArray[i]>255)
				{
					//alert("Destination IP address is invalid!");
					return false;
				}
			}
			return true;
		}

		var atomPat=new RegExp("^" + atom + "$");
		var domArr=domain.split(".");
		var len=domArr.length;

		for (i=0;i<len;i++)
		{
			if (domArr[i].search(atomPat)==-1)
			{
				alert("The domain name does not seem to be valid.");
				//return false;
			}
		}

		if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1)
		{
			//alert("The address must end in a well-known domain or two letter " + "country.");
			return false;
		}

		if (len<2)
		{
			//alert("This address is missing a hostname!");
			return false;
		}

		return true;
	}
	
function getLayer(whichLayer)
{
	if (document.getElementById)
	{
		// this is the way the standards work
		return document.getElementById(whichLayer);
	}
	else if (document.all)
	{
		// this is the way old msie versions work
		return document.all[whichLayer];
	}
	else if (document.layers)
	{
		// this is the way nn4 works
		return document.layers[whichLayer];
	}
}

function changeSubSector(page)
{
	var pars = 'category=' + document.forms.search.category.value;
	pars += '&changed=true';
	var url = 'subsector.php';


	var myAjax = new Ajax.Updater(
		'subSectorArea', 
		url, 
		{
			method: 'get', 
			parameters: pars,
			onFailure: reportError

		});
}

function changeState(page, ignoreChanged)
{

	document.getElementById("resultArea").innerHTML = "<p>loading...</p>";

	var url = 'joblist.php';
	
	var pars = 'location=' + document.forms.search.location.value;
	pars += '&term=' + document.forms.search.term.value;
	pars += '&sector=' + document.forms.search.sector.value;
	pars += '&salary=' + document.forms.search.salary.value;
	pars += '&category=' + document.forms.search.category.value;

	if ( !ignoreChanged )
	{
		pars += '&changed=true';
	}

	if ( page )
	{
		pars += "&page="+page;
	}

	var myAjax = new Ajax.Updater(
		'resultArea', 
		url, 
		{
			method: 'get', 
			parameters: pars,
			onFailure: reportError

		});
}

function changeState2(page, ignoreChanged)
{

	document.getElementById("resultArea").innerHTML = "<p>loading...</p>";

	var url = 'joblist2.php';
	
	var pars = 'location=' + document.forms.search.location.value;
	pars += '&term=' + document.forms.search.term.value;
	pars += '&sector=' + document.forms.search.sector.value;
	pars += '&salary=' + document.forms.search.salary.value;
	pars += '&category=' + document.forms.search.category.value;

	if ( !ignoreChanged )
	{
		pars += '&changed=true';
	}

	if ( page )
	{
		pars += "&page="+page;
	}

	var myAjax = new Ajax.Updater(
		'resultArea', 
		url, 
		{
			method: 'get', 
			parameters: pars,
			onFailure: reportError

		});
}

function nextPage()
{
	changeState(1, true);
}

function prevPage()
{
	changeState(-1, true);
}

function nextPage2()
{
	changeState2(1, true);
}

function prevPage2()
{
	changeState2(-1, true);
}

function reportError()
{
	alert('cannot load results pane');

}


function changeAdminState(url)
{
	document.getElementById("resultArea").innerHTML = "loading...";

	url = "draw/" + url;
	var pars = 'sector=' + document.forms.search.sector.value;
	pars += '&subsector=' + document.forms.search.subsector.value;
	pars += '&changed=true';

	var myAjax = new Ajax.Updater(
		'resultArea', 
		url, 
		{
			method: 'get', 
			parameters: pars,
			onFailure: reportError

		});
}

function changeChildSelect(url)
{

	url = "draw/" + url;

	var pars = 'sector=' + document.forms.search.sector.value;
	pars += '&changed=true';

	var myAjax = new Ajax.Updater(
		'childSelect', 
		url, 
		{
			method: 'get', 
			parameters: pars,
			onFailure: reportError

		});
}

function reportError()
{
	alert('cannot load results pane');

}