function openwin(url,width,height) {
	if (!width) width = 400;
	if (!height) height = 200;
	var newwin = null;
	LeftPosition = (screen.width) ? (screen.width-width)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-height)/2 : 0;
	newwin = window.open(url,"newwin","width="+width+",height="+height+",resizable,scrollbars,left="+LeftPosition+",top="+TopPosition+"");
}

function show_block(block_name,status) {
	if (document.getElementById) {
		document.getElementById(block_name).style.display = (status == false) ? 'none' : 'block';
	}
}

function BlockOver(BlockName,Class) { 
	if (document.getElementById && document.getElementById(BlockName)) {
		document.getElementById(BlockName).className = Class;
	}
}
/* Cookie functions */
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return "";
}
function eraseCookie(name) {
	createCookie(name,"",-1);
}