Jquery: CSS

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">

<div class="puntos inside_tab selected">
		
		<form class="filtro form years" action="http://www.futbolfantasy.com/filtropuntos" method="post">
			<input type="hidden" class="chg_game" name="game" value="comunio" />
			<select name="jornada">
									<option value="7" >Jornada 7</option>
									<option value="6" >Jornada 6</option>
									<option value="5" selected>Jornada 5</option>
									<option value="4" >Jornada 4</option>
									<option value="3" >Jornada 3</option>
									<option value="2" >Jornada 2</option>
									<option value="1" >Jornada 1</option>
							</select>
		</form>

		<select class="js_game">
							<option value="modo-picas"  selected  data-src="http://static.futbolfantasy.com/uploads/images/cabecera/modopicas.png" 							data-picas="1"
						
													data-estrellas="0"
						
													data-cope="0"
						 >Picas</option>
							<option value="futmondo-stats"  data-src="http://static.futbolfantasy.com/uploads/images/cabecera/futmondostats.png" 							data-picas="0"
						
													data-estrellas="0"
						
													data-cope="0"
						 >Futmondo Stats</option>
							<option value="futmondo-prensa"  data-src="http://static.futbolfantasy.com/uploads/images/cabecera/futmondoprensa.png" 							data-picas="1"
						
													data-estrellas="1"
						
													data-cope="0"
						 >Futmondo Prensa</option>
							<option value="comunio"  data-src="http://static.futbolfantasy.com/uploads/images/cabecera/comunio2.png" 							data-picas="0"
						
													data-estrellas="0"
						
													data-cope="0"
						 >Comunio</option>
							<option value="futmondo-mixto"  data-src="http://static.futbolfantasy.com/uploads/images/cabecera/futmondo.png" 							data-picas="0"
						
													data-estrellas="0"
						
													data-cope="1"
						 >Futmondo Mixto</option>
					</select>

JavaScript

$('.js_game option[value="futmondo-mixto"]').attr('selected', 'selected');