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 sndReq(file) {
	var name = document.forms.contact_form.name.value;	
	var email = document.forms.contact_form.email.value;	
	var topic = document.forms.contact_form.topic.value;	
	var subject = document.forms.contact_form.subject.value;	
	var message = document.forms.contact_form.message.value;	
	var variables = "&name=" + name + "&email=" + email + "&topic=" + topic + "&subject=" + subject + "&message=" + message; 
	http.open('POST', file +'.php?'+variables);
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function handleResponse() {
    if(http.readyState == 4){
        var response = http.responseText;
        var update = new Array();

        if(response.indexOf('|' != -1)) {
            update = response.split('|');
            document.getElementById(update[0]).innerHTML = update[1];
        }
    }
}

function openPreview(id)	{
	var i=1;
	while (i<=21) 	{
		if (i == id) {
			document.getElementById('opnImg'+id).style.display='none';
			document.getElementById('clsImg'+id).style.display='inline'; 
			document.getElementById('pvw'+id).style.display='inline'
		}
		else {
		document.getElementById('opnImg'+i).style.display='inline';
		document.getElementById('clsImg'+i).style.display='none'; 
		document.getElementById('pvw'+i).style.display='none'
		}
		i++;
	}
} 
function closePreview(id)	{
		document.getElementById('opnImg'+id).style.display='inline';
		document.getElementById('clsImg'+id).style.display='none'; 
		document.getElementById('pvw'+id).style.display='none'
}