//disable right mouse button
function click() {
if (event.button==2 || event.button==3) {
alert('Button access has been disabled!');return false;
}

}
document.onmousedown=click

//tabs up and down
//tn = tab name
//ud = -1 up, 0 down
function tabs(tn,ud){
	tabfile = document.getElementById(tn).src; //get full path of image
	var filetab = tabfile.split("/"); //split img full paths
	change = filetab[filetab.length-1].split("_"); //split img name
	egnahc = ud?"_up.jpg":"_down.jpg"; //add up or down
	egnahc = change[0] + egnahc; //bring together
	document.getElementById(tn).src = "images/"+egnahc;
}