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document.getElementById('cal1_div').innerHTML = '';document.getElementById('cal2_div').innerHTML = '';document.getElementById('cal3_div').innerHTML = '';function ChngMonth(cal1,cal2,cal3){ document.getElementById(cal1).style.display = ''; document.getElementById(cal2).style.display = 'none'; document.getElementById(cal3).style.display = 'none'; } function ChngBtn(num){ document.getElementById("bt1").style.backgroundColor = 'white'; document.getElementById("bt2").style.backgroundColor = 'white'; document.getElementById("bt3").style.backgroundColor = 'white'; document.getElementById(num).style.backgroundColor = 'pink'; }