var img1=new Image(); img1.src="prod/proma_c1.jpg";
var img2=new Image(); img2.src="prod/proma_c2.jpg";
var img3=new Image(); img3.src="prod/luvipol_c1.jpg";
var img4=new Image(); img4.src="prod/luvipol_c2.jpg";
var img5=new Image(); img5.src="prod/luvipol_c3.jpg";
var img6=new Image(); img6.src="prod/portadeza_c1.jpg";
var img7=new Image(); img7.src="prod/portadeza_c2.jpg";
var img8=new Image(); img8.src="prod/portadeza_c3.jpg";
var img9=new Image(); img9.src="prod/portadeza_c4.jpg";
var img10=new Image(); img10.src="prod/portadeza_c5.jpg";
var img11=new Image(); img11.src="prod/portadeza_c6.jpg";
var img12=new Image(); img12.src="prod/artevi_c1.jpg";
var img13=new Image(); img13.src="prod/artevi_c2.jpg";
var img14=new Image(); img14.src="prod/artevi_c3.jpg";
var img15=new Image(); img15.src="prod/jher_c1.jpg";

function showimg (num) {
window.document.image.src=eval(num).src;
}