function toggleNav(div) {
	if (document.getElementById(div).style.display == "block") {
		document.getElementById(div).style.display = "none";
		if (document.getElementById(div + '_arr').className == "arr_lrg_down") {
			document.getElementById(div + '_arr').className = "arr_lrg";
		} else {
			document.getElementById(div + '_arr').className = "arr_sm";
		}
	} else {
		document.getElementById(div).style.display = "block";	
		if (document.getElementById(div + '_arr').className == "arr_lrg") {
			document.getElementById(div + '_arr').className = "arr_lrg_down";
		} else {
			document.getElementById(div + '_arr').className = "arr_sm_down";
		}
	}
}

function openNav() {
if (filter != "friends" && filter != "mentions") {
	toggleNav('nav_col1'); //open main menu
	if (filter == 'created') {
		toggleNav('nav_col1_2');	
	} else if (filter == 'follow' || filter == '') {
		toggleNav('nav_col1_1');	
	}
 }
 else {
       toggleNav('nav_col1_2');
       toggleNav('nav_col1_1');
 }
	document.getElementById('nav_col1_1').style.visibility = "visible";
	document.getElementById('nav_col1_2').style.visibility = "visible";

}

function setNavHeight() {

	if (document.getElementById("navCol")) {
		var nC = document.getElementById("navCol");	
		var lC = document.getElementById("leftCol");
		var rC = document.getElementById("rightCol");
		var lH = lC.offsetHeight;
		var rH = rC.offsetHeight;
		var nH = nC.offsetHeight;
		if ((nH > rH) && (nH > lH)) {
		      rC.style.height =  nH + "px";
		      lC.style.height =  nH + "px";
		} else if (lH > rH) {
		      rC.style.height =  lH + "px";
		      nC.style.height =  lH + "px";
		} else if (rH > lH) {
		      lC.style.height =  rH + "px";
		      nC.style.height =  rH + "px";
		} 
	}
}