var jpg = 7;
var gif = 5;
var f = false;
var b = new Array;
var c = new Array;

function prel(){
	for(i=1;i<=jpg;i++)
	{
		str = 'buttons/b' + i + '_o.jpg';
		b[i-1] = new Image();
		b[i-1].src = str;
	}
	for(i=1;i<=gif;i++)
	{
		str = 'buttons/b' + i + '_o.gif';
		c[i-1] = new Image();
		c[i-1].src = str;
	}
}

function on(im){document.images[im].src="buttons/"+im+"_o.jpg";}

function off(im){document.images[im].src = "buttons/"+im+".jpg";}

function on_gif(im){document.images[im].src="buttons/"+im+"_o.gif";}

function off_gif(im){document.images[im].src = "buttons/"+im+".gif";}