var current_page;

function select_button () {
	var strhref = window.location.href;
	var a;
	var file_array = new Array();

	
	parts = strhref.split("/");
	if (parts[parts.length - 1]) {
		file_array = parts[parts.length - 1].split(".");
	}
	if (file_array[0] != null) {
		a = document.getElementById(file_array[0]);
		a.src = 'graphics/'+file_array[0]+'_visit.gif';
	}
	else {
		a = document.getElementById('index');
		a.src = 'graphics/index_visit.gif';
	}
	current_page = file_array[0];
}
			

function swap_image (source, imid) {
	var a;
	
	if (current_page != imid) {	
		if (current_page != '') {
			a = document.getElementById(imid);
			a.src = 'graphics/'+source+'.gif';
		}
		else {
			if (imid != 'index') {
				a = document.getElementById(imid);
				a.src = 'graphics/'+source+'.gif';
			}
		}
	}
}