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var glavnaja = document.getElementById ('glv')
glavnaja.onmousedown = function() {
addClass(this, 'glavnaja-click')
}
glavnaja.onmouseup = function() {
removeClass(this, 'glavnaja-click')
}
function addClass(el, cls) {
for(var c = el.className.split(' '),i=c.length-1; i>=0; i--) {
if (c[i] == cls) return
}
el.className += ' '+cls
}
function removeClass(el, cls) {
for(var c = el.className.split(' '),i=c.length-1; i>=0; i--) {
if (c[i] == cls) c.splice(i,1)
}
el.className = c.join(' ')
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