var _this=DOMManager.prototype;
function DOMManager() {}
_this.hideCombos = function() {
	var arCombo = document.getElementsByTagName("select");
	for(var i=0;i<arCombo.length;i++) {
		arCombo[i].style.visibility="hidden";
	}
}
_this.showCombos = function() {
	var arCombo = document.getElementsByTagName("select");
	for(var i=0;i<arCombo.length;i++) {
		arCombo[i].style.visibility="inherit";
	}
}