Google Map Mark Location (Javascript)

var map = new GMap(document.getElementById("map"));
map.addControl(new GSmallMapControl());
map.addControl(new GMapTypeControl());

var b=new Array;
var a=new Array;

var j=0;
var arSize=0;

function convertX(){
a= [];

}

function convertY(){
b= [];
}


convertX();
convertY();

arSize=a.length;

//alert(arSize);
//placeX=[6.9270786,6.3422291,5.949305,6.643322,6.033401];
//placeY=[79.861243,80.8267064,80.535347,80.701897,80.218384];


while(j var point = new GPoint(b[j],a[j]);
var address = 'Stollen places';

var mark = createInfoMarker(point, address);
map.addOverlay(mark);
j++;
}

function createInfoMarker(point, address) {
var marker = new GMarker(point);
map.centerAndZoom(point, 5);
GEvent.addListener(marker, "click",
function() {
marker.openInfoWindowHtml(address);
}
);
return marker;
}

// array a= echo implode(',', $x1)
// array b= echo implode(',', $y1)