function change_block(x) {
    if(x==1) {
        document.getElementById('block1').style.display = "block";
        document.getElementById('block2').style.display = "none";
        document.getElementById('bb1').className = "spec act";
        document.getElementById('bb2').className = "spec pas";
    }
	if(x==2) {
        document.getElementById('block1').style.display = "none";
        document.getElementById('block2').style.display = "block";
        document.getElementById('bb1').className = "spec pas";
        document.getElementById('bb2').className = "spec act";
    }
	if(x==3) {
        document.getElementById('block3').style.display = "block";
		document.getElementById('block4').style.display = "none";
        document.getElementById('bb3').className = "spec act";
        document.getElementById('bb4').className = "spec pas";
    }
	if(x==4) {
        document.getElementById('block3').style.display = "none";
		document.getElementById('block4').style.display = "block";
        document.getElementById('bb3').className = "spec pas";
        document.getElementById('bb4').className = "spec act";
    }
	if(x==5) {
        document.getElementById('block5').style.display = "block";
		document.getElementById('block6').style.display = "none";
        document.getElementById('bb5').className = "spec act";
        document.getElementById('bb6').className = "spec pas";
    }
	if(x==6) {
        document.getElementById('block5').style.display = "none";
		document.getElementById('block6').style.display = "block";
        document.getElementById('bb5').className = "spec pas";
        document.getElementById('bb6').className = "spec act";
    }
	if(x==7) {
        document.getElementById('block7').style.display = "block";
		document.getElementById('block8').style.display = "none";
        document.getElementById('bb7').className = "spec act";
        document.getElementById('bb8').className = "spec pas";
    }
	if(x==8) {
        document.getElementById('block7').style.display = "none";
		document.getElementById('block8').style.display = "block";
        document.getElementById('bb7').className = "spec pas";
        document.getElementById('bb8').className = "spec act";
    }
}