function waitPreloadPage() { //DOM
	document.getElementById('prepage').style.visibility='visible';
}
<!-- //Browser Support Code -->
function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}
var http = createRequestObject();

function sndrentReq(action) {
	
    http.open('get', action);
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function handleResponse() {
    if(http.readyState == 4){
      if(http.responseText!=null) {
	      
	    
	 /* var display = document.getElementById('subregiondiv');
	    display.innerHTML = http.responseText; 
	   */  
		
	    var sc	= http.responseText.split("|");
	    //alert(sc);
	     var j=1;
	     var k=0;
	        // before inserting new data clear old one.
	     var sellength	= document.form1.subregion.length;
	  
	     for(var a=0;a<=sellength;++a)
	     {
		     document.form1.subregion.options[a]=null
	     }
	     for (var i=0; i < sc.length-1;i=i+2){

		var option	= "option"+k;
		option	= new Option(sc[i],sc[j])
		document.form1.subregion.options[k]=option
		//addOption(document.form1.subregion, sc[i], sc[j]);
		var j=j+2;
		var k=k+1;
		}
	    }
    }
}