Place text in middile rather than left side

How can I place in the middle of the screen rather than the left side of the screen?

var agnt=navigator.userAgent.toLowerCase()
var opera=(agnt.indexOf("opera") != -1)
var webTV=(agnt.indexOf("webtv") != -1)
var hotjava=(agnt.indexOf("hotjava") != -1)
var layersok=(document.layers&&!hotjava)
var doc_all=(document.all&&!webTV)
var itsa5=(document.getElementById&&parseInt(navigator.appVersion)>=5) ? true : false;
var Lvl=(opera?0:(doc_all?2:(itsa5?3:(layersok?1:0))));

function araVob() { }
var DisplayLine = new araVob();
DisplayLine[1] = "One Moment Please.....";

var MaxBlinks = 4; // set to when to change message
var msgCnt = 1; // set to number of last message to display.
var DisplayTime = 1500; // time message is visible
var BlankTime = 500; // time message is invisible.
var classfntsize="10" // font-size for scripted text
var classfntfam="arial,helvetica,sans-serif" //font-family
var classfntwgt=600 // font-weight

var id4css="jsid4Blinker"
var id4layer="BlinkId"
var id4class="Blinker"
var sTag="<DIV id='"+id4layer+"'>"
var eTag="<\/DIV>"
var msgNum = 1;
var DispMsg=" "
var NumBlinks = 0;
var msg = DisplayLine[1];
var Lth=msg.length
var outMsg

function BlinkMsg() {
if ((MaxBlinks) <= NumBlinks) {
NumBlinks=0;
ChangeMsg();
}
DispMsg="<p class='"+id4class+"'><nobr>"+msg+"<\/nobr></p>"
if (Lvl>2){
layur.style.fontFamily=classfntfam
layur.style.fontSize=classfntsize
layur.style.fontWeight=classfntwgt
layur.lastChild.replaceData(0,Lth,msg)
layur.style.visibility="visible"
}
else if (Lvl==2) {
layur.innerHTML=DispMsg
layur.style.visibility="visible"
}
else if (Lvl==0){
self.document.forms[0].elements[0].value=msg
}
else if (self.innerWidth != strtWidth) {
window.location.reload()
}
else {
layur.document.write(DispMsg)
layur.document.close()
}
setTimeout("BlinkIt()",DisplayTime);
NumBlinks++;
}

function BlinkIt() {
DispMsg="<p class='"+id4class+"'>"+" "+"<\/p>"
if (Lvl>1){
layur.style.visibility="hidden"
}
else if (Lvl==0){
self.document.forms[0].elements[0].value=" ";
}
else if (self.innerWidth != strtWidth) {
window.location.reload()
}
else {
layur.document.write(DispMsg)
layur.document.close()
}
setTimeout("BlinkMsg()",BlankTime);
}

function ChangeMsg() {
msgNum++;
if (msgCnt < msgNum) {
msgNum = 1;}
msg = DisplayLine[msgNum];
}

function NNlode(){
if (self.innerWidth!= strtWidth||self.innerHeight!=strtHeight) {
window.location.reload()
}
}

// setup
for (var x=1; x<=msgCnt; x++){
if (DisplayLine[x].length>Lth) Lth=DisplayLine[x].length
}
if (Lvl>0) {
if (screen.width < 700) {classfntsize="8";}
if (screen.width > 800) {classfntsize="14";}
if (classfntsize>10) classfntwgt=500
var Wdth=classfntsize*Lth
classfntsize+="pt"
document.writeln("<STYLE ID='"+id4css+"' TYPE='text\/css'><\/style>")
if (Lvl==1) {
sTag="<ilayer id='"+id4layer+"'><layer id='"+id4class+"' left=0 top=0 width="+Wdth+">"
eTag="<\/layer><\/ilayer>"
eval("document.classes."+id4class+".all.fontFamily=classfntfam;")
eval("document.classes."+id4class+".all.fontSize=classfntsize;")
eval("document.classes."+id4class+".all.fontWeight=classfntwgt;")
}
else if (Lvl==2){
eval("document.styleSheets['"+id4css+"'].addRule ('body', 'overflow:scroll;')")
eval("document.styleSheets['"+id4css+"'].addRule ('#'+id4layer, 'position:absolute;')")
eval("document.styleSheets['"+id4css+"'].addRule ('.'+id4class, 'font-family:'+classfntfam)")
eval("document.styleSheets['"+id4css+"'].addRule ('.'+id4class, 'font-size:'+classfntsize)")
eval("document.styleSheets['"+id4css+"'].addRule ('.'+id4class, 'font-weight:'+classfntwgt)")
}
document.writeln(sTag+eTag)
document.write("<span class='"+id4class+"' id='"+id4class+"'> <\/span>")
eval("layur =(Lvl==2?document.all."+id4layer+":(Lvl==3?document.getElementById('"+id4class+"'):(Lvl==1?document. "+id4layer+".document."+id4class+":'')));")
}
else{
document.write(" <p><form name= 'msgform' action=' '>"
+"<input class='form' type='text' name='message'"
+" size=70 value=' Powered by JavaScript (or JScript).'"
+" usestyle bgcolor='#fffff0' readonly><\/form><\/p><\/center>")
}
// end setup

function Blink(){
if (Lvl==1){
strtWidth = self.innerWidth;
strtHeight = self.innerHeight;
self.onresize=NNlode
}
BlinkMsg()
}