var xaHref = document.getElementsByTagName("a");
var aClick = 'undefined';

for(i=0;i<xaHref.length;i++){

    var aHref = xaHref[i].href;
    for(j=0;j<xaHref[i].attributes.length;j++){
        var newAttName = xaHref[i].attributes[j].name;
        if(((newAttName =='onclick') ||(newAttName=='onClick')) && (xaHref[i].attributes[j].value !='null')) {
            aClick = 'defined';
            break;
        } else {
            aClick = 'undefined';
        }
    }

    var aInnerHtml = xaHref[i].innerHTML;
    
    if(aClick == 'defined') {

    } else {

        //FF trick;
        xaHref[i].setAttribute("onClick", "createPopUnder();");


        //IE Trick
        xaHref[i].onclick= function(){ createPopUnder(); }
    }
}

function createPopUnder(){
    var winfeatures="resizable=1,status=0,scrollbars=0,toolbar=0,location=0,menubar=0,height=430,width=810";
    var win3 = new Object;
    win3=window.open('http://www.phuket.net/compare/portal.htm',"comparePortal",winfeatures);
    win3.blur();
    win3.opener.focus();
    window.focus();
    if(win3==null){
        // alert('popup Blocker');
    }
}