Array.prototype.IndexOf=function(object)
{
	var index=-1;
	for(i=0;i<this.length;i++)
	{
		if(this[i]==object)
		{
			index=i;
			break;
		}
	}
	return index;
};
Array.prototype.contains==function(object)
{
	var Isbool=false;
	if(object&&this.IndexOf(object)!=-1)
	{
		Isbool=true;
	}
	return Isbool;
};
Array.prototype.append=function(object)
{
	if(object&&!this.contains(object))
	{
		this[this.length]=object;
	}
};