function previewSig(image) {
	var href = "previewSig.php?image="+image;
	window.open(href, "Preview Image", "width=400, height=300, status=yes");
}
function previewPython(file) {
	var href = "previewPython.php?file="+file;
	window.open(href, "Preview Python", "width=400, height=300, status=yes");
}
function previewArt(art) {
	var href = "previewArt.php?art="+art;
	window.open(href, "Preview Artwork", "width=600, height=500, status=yes");
}