function aff_img(img) {
	if (img) {
		document.getElementById('grande').src = "references/references-grandes/" + img;
	}
}

function page_suivante() {
var page = document.form_references.page.value;
var nb_max = document.form_references.nb_max.value;

if (page > 1) {

	var j = 1 + (18 * page);
	for (i=j-18;i<=j-1;i++) {
		document.getElementById('ref_'+i).style.display='none';
	}
	if (eval(j+17) > nb_max) {
		for (i=j;i<=nb_max;i++) {
			document.getElementById('ref_'+i).style.display='block';
		}
		document.getElementById('suivant').style.visibility='hidden';
	} else {
		for (i=j;i<=j+11;i++) {
			document.getElementById('ref_'+i).style.display='block';
		}
	}
	document.form_references.page.value = eval(page) + 1;

} else {

	for (i=1;i<=18;i++) {
		document.getElementById('ref_'+i).style.display='none';
	}
	if (nb_max < 36) {
		for (i=19;i<=nb_max;i++) {
			document.getElementById('ref_'+i).style.display='block';
		}
		document.getElementById('suivant').style.visibility='hidden';
	} else {
		for (i=19;i<=36;i++) {
			document.getElementById('ref_'+i).style.display='block';
		}
	}
	document.getElementById('precedent').style.visibility='visible';
	document.form_references.page.value = "2";

}
}

function page_precedente() {
var page = document.form_references.page.value;
var nb_max = document.form_references.nb_max.value;

var j = 1 + (18 * page);

	if (eval(j) > nb_max) {
		for (i=j-18;i<=nb_max;i++) {
			document.getElementById('ref_'+i).style.display='none';
		}
		document.getElementById('suivant').style.visibility='visible';
	} else {
		for (i=j-18;i<=j-1;i++) {
			document.getElementById('ref_'+i).style.display='none';
		}
	}
	for (i=j-36;i<=j-19;i++) {
		document.getElementById('ref_'+i).style.display='block';
	}
	document.form_references.page.value = eval(page) - 1;

	if (page == 2) {
		document.getElementById('precedent').style.visibility='hidden';
	}

}

function init() {
	document.form_references.page.value = "";
}