if ( !img_prefix )
    img_prefix = '';

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
	    //alert("changeImages("+changeImages.arguments[0]+","+changeImages.arguments[1]+")");
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = img_prefix+changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
/*		naegcNavigation_com_over = newImage("images/gui/naegcNavigation_com-over.gif");
		naegcNavigation_com_On = newImage("images/gui/naegcNavigation_com-On.gif");
		naegcNavigation_iss_over = newImage("images/gui/naegcNavigation_iss-over.gif");
		naegcNavigation_iss_On = newImage("images/gui/naegcNavigation_iss-On.gif");
		naegcNavigation_sol_over = newImage("images/gui/naegcNavigation_sol-over.gif");
		naegcNavigation_sol_On = newImage("images/gui/naegcNavigation_sol-On.gif");
		naegcNavigation_gc_over = newImage("images/gui/naegcNavigation_gc-over.gif");
		naegcNavigation_gc_On = newImage("images/gui/naegcNavigation_gc-On.gif");
		naegcSubPageNav_com_over = newImage("images/gui/naegcSubPageNav_com-over.gif");
		naegcSubPageNav_com_On = newImage("images/gui/naegcSubPageNav_com-On.gif");
		naegcSubPageNav_iss_over = newImage("images/gui/naegcSubPageNav_iss-over.gif");
		naegcSubPageNav_iss_On = newImage("images/gui/naegcSubPageNav_iss-On.gif");
		naegcSubPageNav_sol_over = newImage("images/gui/naegcSubPageNav_sol-over.gif");
		naegcSubPageNav_sol_On = newImage("images/gui/naegcSubPageNav_sol-On.gif");
		naegcSubPageNav_gc_over = newImage("images/gui/naegcSubPageNav_gc-over.gif");
		naegcSubPageNav_gc_On = newImage("images/gui/naegcSubPageNav_gc-On.gif");
		naegcEmailThis_over = newImage("images/gui/naegcEmailThis-over.gif");
		naegcPrintThis_over = newImage("images/gui/naegcPrintThis-over.gif");
		naegcComment_over = newImage("images/gui/naegcComment-over.gif");
		naegcSearch_over = newImage("images/gui/naegcSearch-over.gif");*/
		preloadFlag = true;
	}
}

function ShowState_On() {
	changeImages('naegcSubPageNav_com', 'naegcSubPageNav_com_On');
}

function ShowState_On() {
	changeImages('naegcSubPageNav_iss', 'naegcSubPageNav_iss_On');
}

function ShowState_On() {
	changeImages('naegcSubPageNav_sol', 'naegcSubPageNav_sol_On');
}

function ShowState_On() {
	changeImages('naegcSubPageNav_gc', 'naegcSubPageNav_gc_On');
}


function rollbg(chosen, objectID) {
	if(chosen == "subNavChildOver") {
		document.getElementById(objectID).className="subNavChildOver";
	}
	else if(chosen == "subNavParentOver") {
		document.getElementById(objectID).className="subNavParentOver";
	}
	else if(chosen == "subNavSectionOver") {
		document.getElementById(objectID).className="subNavSectionOver";
	}
	else if(chosen == "subNavChild") {
		document.getElementById(objectID).className="subNavChild";
	}
	else if(chosen == "subNavParent") {
		document.getElementById(objectID).className="subNavParent";
	}
	else if(chosen == "subNavSection") {
		document.getElementById(objectID).className="subNavSection";
	}
	else if(chosen == "subNavChildOn") {
		document.getElementById(objectID).className="subNavChildOn";
	}
	else if(chosen == "subNavParentOn") {
		document.getElementById(objectID).className="subNavParentOn";
	}
	else if(chosen == "subNavSectionOn") {
		document.getElementById(objectID).className="subNavSectionOn";
	}
}