function disableAllButtons(){
	var els = document.forms[0].elements;
	for( var i = 0 ; i < els.length ; i ++){
		if(els[i].type == "button" || els[i].type == "submit"){
			els[i].disabled = true;
		}
	}
}

function disableSomeButtons(arr){
	if(arr == null)return;
	for( var i = 0 ; i < arr.length ; i ++){
		var el = document.getElementById(arr[i]);
		if(el.type == "button" || el.type == "submit"){
			el.disabled = true;
		}
	}
}

function enableAllButtons(){
	var els = document.forms[0].elements;
	for( var i = 0 ; i < els.length ; i ++){
		if(els[i].type == "button" || els[i].type == "submit"){
			els[i].disabled = false;
		}
	}
}

function enableSomeButtons(arr){
	if(arr == null)return;
	for( var i = 0 ; i < arr.length ; i ++){
		var el = document.getElementById(arr[i]);
		if(el.type == "button" || el.type == "submit"){
			el.disabled = false;
		}
	}
}