function std() {

document.getElementById("std").style.display = 'block';
document.getElementById("adv").style.display = 'none';
document.getElementById("celladv").style.backgroundColor = "#FEFFE1";
document.getElementById("cellstd").style.backgroundColor = "#EDECFF";
document.getElementById("cellstd").className = "borderright";
document.getElementById("celladv").className = "borderbottom";
  
    }
	
	    function adv() {
	  
document.getElementById("adv").style.display = 'block';
document.getElementById("std").style.display = 'none';
document.getElementById("celladv").style.backgroundColor = "#EDECFF";
document.getElementById("cellstd").style.backgroundColor = "#FEFFE1";
document.getElementById("cellstd").className = "borderbottom";
document.getElementById("celladv").className = "borderleftright";

    }