// JavaScript Document

function Is() {

  var agent = navigator.userAgent.toLowerCase();

  this.major = parseInt(navigator.appVersion);

  this.minor = parseFloat(navigator.appVersion);

  this.ns = ((agent.indexOf('mozilla')!=-1) &&

((agent.indexOf('spoofer')==-1) && (agent.indexOf('compatible')== -1))); 

  this.ns4 = (this.ns && (this.major >= 4));

  this.ie = (agent.indexOf("msie") != -1);

  this.ie4 = (this.ie && (this.major >= 4));



}


function openwindow (){

	var is = new Is();



	var w=750;   //set Width for window 

	var h=550;   //set Height for window

	if(is.ns4){             


		var Xcor = (screen.width-w)/2; 

		var Ycor = (screen.height-h)/2

		//window.moveTo(Xcor, Ycor);



	}

	else if(is.ie4){         //if Internet Explorer 4


		var Ycor=(screen.height-h)/2;

		var Xcor=(screen.width-w)/2;

		//window.moveTo(Xcor, Ycor);

	}


	window.open('index.htm','jpracecars','status=no,toolbar=no,location=no,scrollbars=no,top='+Ycor+',left='+Xcor+',width='+w+',height='+h+',resizable=no')

}


<!--
function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}
//-->