/**
 *
 * Hide an element by ID.
 *
 * @param {String} id
 *
 * @returns nothing
 *
 */
function hide( id ) {
  document.getElementById(id).style.display = 'none';
}

/**
 *
 * Show an element by ID.
 *
 * @param {String} id
 *
 * @returns nothing
 *
 */
function show( id ) {
  document.getElementById(id).style.display = '';
}


function showMain() {
	show('pageMain');
	hide('pageLetter');
	hide('pageRFP');
	hide('pageIssues');
	hide('pageFAQ');
	hide('pageLinks');
}

function showLetter() {
	hide('pageMain');
	show('pageLetter');
	hide('pageRFP');
	hide('pageIssues');
	hide('pageFAQ');
	hide('pageLinks');
}

function showRFP() {
	hide('pageMain');
	hide('pageLetter');
	show('pageRFP');
	hide('pageIssues');
	hide('pageFAQ');
	hide('pageLinks');
}

function showIssues() {
	hide('pageMain');
	hide('pageLetter');
	hide('pageRFP');
	show('pageIssues');
	hide('pageFAQ');
	hide('pageLinks');
}

function showFAQ() {
	hide('pageMain');
	hide('pageLetter');
	hide('pageRFP');
	hide('pageIssues');
	show('pageFAQ');
	hide('pageLinks');
}

function showLinks() {
	hide('pageMain');
	hide('pageLetter');
	hide('pageRFP');
	hide('pageIssues');
	hide('pageFAQ');
	show('pageLinks');
}