function login_user() {
	var username = $("login_name");
	var password = $("login_pass");


	if((username.value.length < 1) || (password.value.length < 1)) {
		alert("Keine oder nicht alle erforderlichen Daten eingegeben!");
	} else {
		var myDiv = $("profcont");
		var loading = $("profcont_loading_animation");

		new Effect.Fade($(myDiv), {duration: 0});


		new Effect.Appear($(loading), {duration: 0.2});
		$(myDiv).innerHTML = "";

		var pars = 'name='+username.value+'&pass='+password.value;
		var url = 'ajaxfiles/login.php';
		var myAjax = new Ajax.Updater(myDiv, url,
		{
			method: 'post', 
			parameters: pars,
			evalScripts: true,
			onComplete: function(request)
			{
			  if(request.status == 200)
			  {
					myDiv.innerHTML = request.responseText;
					new Effect.Fade($(loading), {duration: 0.3});
					new Effect.Appear($(myDiv), {duration: 0.4, delay: 0.4});
			  }
			}
		});
	}
}