glowna=new Image
	glowna_z=new Image
	oferta=new Image
	oferta_z=new Image
	kontakt=new Image
	kontakt_z=new Image
	praca=new Image
	praca_z=new Image
	
	glowna.src='images/glowna.png'
	glowna_z.src='images/glowna_z.png'
	oferta.src='images/oferta.png'
	oferta_z.src='images/oferta_z.png'
	kontakt.src='images/kontakt.png'
	kontakt_z.src='images/kontakt_z.png'
	praca.src='images/praca.png'
	praca_z.src='images/praca_z.png'