function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	el.style.display = 'block';}
	else {el.style.display = 'none';}
}
function blanket_size(popUpDivVar) {

	if (typeof window.innerWidth != 'undefined') {
		viewportheight = window.innerHeight;
	} else {
		viewportheight = document.documentElement.clientHeight;
	}

	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		blanket_height = viewportheight;
	} else {

		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			blanket_height = document.body.parentNode.clientHeight;
		} else {
			blanket_height = document.body.parentNode.scrollHeight;
		}
	}

	var blanket = document.getElementById('blanket');

	blanket.style.height = blanket_height + 'px';
	
		if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for MSIE x.x;
 		var ieversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 		if(ieversion<=6) {
 			var scrolly = document.documentElement.scrollTop;
 			var viewportheight = document.documentElement.clientHeight;
 			var login_height = scrolly + viewportheight/2 - 162;
 			var login_div = document.getElementById('login_div');
 			login_div.style.top = login_height + 'px';
 		}
 		}

	var popUpDiv = document.getElementById(popUpDivVar);

   
}
function window_pos(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerHeight;
	} else {
		viewportwidth = document.documentElement.clientHeight;
	}
	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		window_width = viewportwidth;
	} else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			window_width = document.body.parentNode.clientWidth;
		} else {
			window_width = document.body.parentNode.scrollWidth;
		}
	}
	var popUpDiv = document.getElementById(popUpDivVar);
	window_width=window_width/2-500;//150 is half popups width

  	
}
function login_prompt() {
	blanket_size('login_div');
	window_pos('login_div');
	toggle('blanket');
	toggle('login_div');
	var el = document.getElementById('login_div');

 			

        return false;	
}

function close_login() {
	toggle('login_div');
	toggle('blanket');
	
}

function logout() {

}