// Rollover functions
function imghighlight(whichimg) {
	var imgsrc = new String(whichimg.src);
	imgsrc = imgsrc.replace(new RegExp('_off\.','g'),'_on\.');
	whichimg.src = imgsrc;
}

function imgnohighlight(whichimg) {
	var imgsrc = new String(whichimg.src);
	imgsrc = imgsrc.replace(new RegExp('_on\.','g'),'_off\.');
	whichimg.src = imgsrc;
}


/****************************************************************
pop-up window functionality
*****************************************************************/
window.onerror=null;
var win = null;

function newWindow(mypage, myname, w, h, scroll) {
closePopWin();
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',noresize';
win = window.open(mypage, myname, winprops);
}

function closePopWin() {
     if(win != null) {
          if(!win.closed) {
              win.close();
              win = null;
          } else {
              win = null;
          }
     }
}
/****************************************************************
pop-up window functionality
*****************************************************************/



/****************************************************************
mouseover events nav
*****************************************************************/

// Browser-specific div references
var divswitch = ''
var styleswitch = ''

if (document.all) {
 	divswitch = 'document.all.';
 	styleswitch = '.style';
} else if (document.layers) {
	divswitch = 'document.layers.';
	styleswitch = '';
} else if (navigator.appName == 'Netscape' && parseFloat(navigator.appVersion) >= 5) {
	divswitch = 'document.getElementById("';
	styleswitch = '").style';
}


// Define on and off states for main navigation
var offstate = new Array();
var onstate = new Array();

offstate['casterswheels'] = new Image ();
offstate['casterswheels'].src = imagedir + 'casterswheels_off.gif';
offstate['engineeredhinges'] = new Image ();
offstate['engineeredhinges'].src = imagedir + 'engineeredhinges_off.gif';
offstate['haydockcasters'] = new Image ();
offstate['haydockcasters'].src = imagedir + 'haydockcasters_off.gif';
offstate['stockerhinges'] = new Image ();
offstate['stockerhinges'].src = imagedir + 'stockerhinges_off.gif';
offstate['tubularproducts'] = new Image ();
offstate['tubularproducts'].src = imagedir + 'tubularproducts_off.gif';
offstate['erwagner'] = new Image ();
offstate['erwagner'].src = imagedir + 'erwagner_off.gif';

onstate['casterswheels'] = new Image ();
onstate['casterswheels'].src = imagedir + 'casterswheels_on.gif';
onstate['engineeredhinges'] = new Image ();
onstate['engineeredhinges'].src = imagedir + 'engineeredhinges_on.gif';
onstate['haydockcasters'] = new Image ();
onstate['haydockcasters'].src = imagedir + 'haydockcasters_on.gif';
onstate['stockerhinges'] = new Image ();
onstate['stockerhinges'].src = imagedir + 'stockerhinges_on.gif';
onstate['tubularproducts'] = new Image ();
onstate['tubularproducts'].src = imagedir + 'tubularproducts_on.gif';
onstate['erwagner'] = new Image ();
onstate['erwagner'].src = imagedir + 'erwagner_on.gif';

// Rollover functions

var timerflag = 0;

function activatenav(whichnav) {
	if (timerflag != 0) {
		cleartimer();
	}
	deactivatenav(activenav);
	activenav = whichnav;
	if (activenav != basenav) {
		rollon(whichnav);
	}
	eval(divswitch + 'divnav' + whichnav + styleswitch + '.visibility="visible"');
}

//this function will reset the nav to default
function activatenavbase(whichnav) {
	if (timerflag != 0) {
		cleartimer();
	}
	deactivatenav(activenav);
	activenav = whichnav;
	if (activenav != basenav) {
		rollon(whichnav);
	}
	//eval(divswitch + 'divnav' + whichnav + styleswitch + '.visibility="visible"');
}

function deactivatenav(whichnav) {
	if (activenav != basenav) {
		rolloff(whichnav);
	}
	eval(divswitch + 'divnav' + whichnav + styleswitch + '.visibility="hidden"');
}

function rollon(whichnav) {
	document.images[whichnav].src = onstate[whichnav].src;
}

function rolloff(whichnav) {
	document.images[whichnav].src = offstate[whichnav].src;
}


// Timer functions

function settimer() {
	timer = setTimeout('activatenavbase(basenav);',750);
	timerflag = 1;
}

function cleartimer() {
	if (timerflag != 0) {
		clearTimeout(timer);
	}
}