var clickOnIj = function(){
 document.getElementById('msk').className = 'displayNone';
 document.getElementById('msk_scheme').className = 'displayNone';
 document.getElementById('ijv').className = 'displayYes';
}

var clickOnMsk = function(){
 document.getElementById('msk').className = 'displayYes';
 document.getElementById('ijv').className = 'displayNone';
 document.getElementById('msk_scheme').className = 'displayYes';
 document.getElementById('ijv_a').className = 'displayYes';
}