function GetId(id){
	return document.getElementById(id);
}

function changeHidden (obj){
	if(!obj || !obj.style) { return false; }
	if(obj.style.visibility == 'hidden'){
		obj.style.visibility = 'visible';
	} else {
		obj.style.visibility = 'hidden';
	}
}

function changeDisplay (obj,noblock_value){
	if(!obj || !obj.style) { return false; }
	if(obj.style.display=='none'){
		obj.style.display = (noblock_value && !document.all?noblock_value:'block');
	} else {
		obj.style.display='none';
	}
}

function Popup(url,name,params){
	if(!params) {
		params = 'width=400,height=250,toolbars=0,status=0,scrollbars=1,resizable=1';
	}
	if(!name) { name = 'p'; }
	var w = window.open(url,name,params);
	return w;
}