function gallery(id)
	{
		if(id==1){
					document.getElementById("bigimage").style.background = "url(images/petroglyphs/hawaiian_petroglyphs.jpg)";
					document.getElementById("caption").innerHTML='Hawaiian petroglyphs';
										}
		if(id==2){
					document.getElementById("bigimage").style.background = "url(images/petroglyphs/ancient_petroglyphs.jpg)";
					document.getElementById("caption").innerHTML='Ancient petroglyphs';
					}
		if(id==3){
					document.getElementById("bigimage").style.background = "url(images/petroglyphs/petroglyph_on_lava_rocks.jpg)";
					document.getElementById("caption").innerHTML='Petroglyph on lava rock';
					}
		if(id==4){
					document.getElementById("bigimage").style.background = "url(images/petroglyphs/modern_petroglyphs.jpg)";
					document.getElementById("caption").innerHTML='Modern petroglyphs';
					}
		if(id==5){
					document.getElementById("bigimage").style.background = "url(images/petroglyphs/puako_petroglyphs.jpg)";
					document.getElementById("caption").innerHTML='Puako petroglyphs, Big Island';
					}
					
					}