function switch_flash(a,b) {
	element_display_none(a);
	element_display_block(b);
}

function element_display_block(divID) {
	document.getElementById(divID).style.display = 'block';
}

function element_display_none(divID) {
	document.getElementById(divID).style.display = 'none';
}

function openModule(id,n,modName) {	
	var active_tab_id = id;
	var active_tab_img_id = "tab_img_" + n;
	
	var arrayTabs = new Array();
	arrayTabs[0]="tab_1";
	arrayTabs[1]="tab_2";
	arrayTabs[2]="tab_3";
	arrayTabs[3]="tab_4";
	arrayTabs[4]="tab_5";
	arrayTabs[5]="tab_6";
	
	var arrayTabsImages = new Array();
	arrayTabsImages[0]="tab_img_1";
	arrayTabsImages[1]="tab_img_2";
	arrayTabsImages[2]="tab_img_3";
	arrayTabsImages[3]="tab_img_4";
	arrayTabsImages[4]="tab_img_5"; 
	arrayTabsImages[5]="tab_img_6"; 
	
	if (document.getElementById(active_tab_id).className !== "tab_active") {
		document.getElementById(active_tab_id).className = "tab_active";
		document.getElementById(active_tab_img_id).src = "images/"+active_tab_id+"_on.png";
		openSubContent(modName);
	}
	
	for (i=0;i<arrayTabs.length;i++) {
		if (arrayTabs[i]!==id) {
			document.getElementById(arrayTabs[i]).className = "tab_inactive";
			document.getElementById(arrayTabsImages[i]).src = "images/tab_"+(i+1)+"_off.png";
		}
	}
	
	
}

function handleTabMouseOver(tab_id,img_id,n) {
	
	if (document.getElementById(tab_id).className !== "tab_active") {
		document.getElementById(img_id).src = "images/tab_"+n+"_over.png";
	}
	
}

function handleTabMouseOut(tab_id,img_id,n) {
	
	if (document.getElementById(tab_id).className !== "tab_active") {
		document.getElementById(img_id).src = "images/tab_"+n+"_off.png";
	}
	
}




function openSubModule(id,n,type,name) {
	
	var active_sub_tab_id = id;
	var active_sub_tab_img_id = type+"_sub_tab_img_" + n;
	
	var arraySubTabs = new Array();
	arraySubTabs[0]=type+"_sub_tab_1";
	arraySubTabs[1]=type+"_sub_tab_2";
	arraySubTabs[2]=type+"_sub_tab_3";
	arraySubTabs[3]=type+"_sub_tab_4";
	arraySubTabs[4]=type+"_sub_tab_5";
	
	var arraySubTabsImages = new Array();
	arraySubTabsImages[0]=type+"_sub_tab_img_1";
	arraySubTabsImages[1]=type+"_sub_tab_img_2";
	arraySubTabsImages[2]=type+"_sub_tab_img_3";
	arraySubTabsImages[3]=type+"_sub_tab_img_4";
	arraySubTabsImages[4]=type+"_sub_tab_img_5";
	
	if (document.getElementById(active_sub_tab_id).className !== "sub_tab_active") {
		document.getElementById(active_sub_tab_id).className = "sub_tab_active";
		document.getElementById(active_sub_tab_img_id).src = "images/"+active_sub_tab_id+"_on.png";
		// if sub nav for Field Guide
		if (type == "fg") {
			changeFieldGuide(id, name);
		}
	}
	
	for (i=0;i<arraySubTabs.length;i++) {
		// TEMPORARY EXCLUSION of Field Guide sub nav 3 (array item 2) for Landbirds
		if ((arraySubTabs[i]!==id) && (i !== 2)) {
			document.getElementById(arraySubTabs[i]).className = "sub_tab_inactive";
			document.getElementById(arraySubTabsImages[i]).src = "images/"+type+"_sub_tab_"+(i+1)+"_off.png";
		}
	}
	
	
	
}

function handleSubTabMouseOver(sub_tab_id,img_id,n,type) {
	
	if (document.getElementById(sub_tab_id).className !== "sub_tab_active") {
		document.getElementById(img_id).src = "images/"+type+"_sub_tab_"+n+"_on.png";
	}
	
}

function handleSubTabMouseOut(sub_tab_id,img_id,n,type) {
	
	if (document.getElementById(sub_tab_id).className !== "sub_tab_active") {
		document.getElementById(img_id).src = "images/"+type+"_sub_tab_"+n+"_off.png";
	}
	
}

function changeFieldGuide(id, name) {

	var arrayFieldGuides = new Array();
	arrayFieldGuides[0]="seabirds";
	arrayFieldGuides[1]="marine_mammals";
	arrayFieldGuides[2]="landbirds"; //currently disabled
	arrayFieldGuides[3]="sharks";
	arrayFieldGuides[4]="intertidal";
	
	for (i=0;i<arrayFieldGuides.length;i++) {
		if (arrayFieldGuides[i]!==name) {
			document.getElementById("field_guide_"+arrayFieldGuides[i]).style.display = "none";
			document.getElementById("field_guide_"+arrayFieldGuides[i]).style.left = "-9999px";
		}
	}
	
	document.getElementById("field_guide_"+name).style.display = "block";
	document.getElementById("field_guide_"+name).style.left = "0";
	
}


function openSubContent(modName) {
	
	var arraySubContentSections = new Array();
	arraySubContentSections[0]="field_guide";
	arraySubContentSections[1]="the_islands";
	arraySubContentSections[2]="the_project";
	arraySubContentSections[3]="partners";
	arraySubContentSections[4]="blog";
	arraySubContentSections[5]="share";
	
	document.getElementById("sub_content_"+modName).style.display = "block";
	document.getElementById("sub_content_"+modName+"_bottom").style.display = "block";
	
	for (i=0;i<arraySubContentSections.length;i++) {
		if (arraySubContentSections[i]!==modName) {
			document.getElementById("sub_content_"+arraySubContentSections[i]).style.display = "none";
			document.getElementById("sub_content_"+arraySubContentSections[i]+"_bottom").style.display = "none";
		}
	}
	
	if (modName !== "field_guide") {
		document.getElementById("field_guide_subnav").style.display = "none";
	} else {
		document.getElementById("field_guide_subnav").style.display = "block";
	}
	

}