function validateForm(obj) {
    if(obj.name.value=="") {
        alert("Please fill in your name");
        obj.name.focus();
        return false;
    }
    if(obj.email.value=="") {
        alert("Please fill in the email address");
        obj.email.focus();
        return false;
    }
    return true;
}

// Variables, mainly for Netscape 4

var max = 5;
var headerheight = 60;
var heights = new Array(170,920,470,90,90);
var shown = new Array();
var safe = headerheight*max;
for (i=0;i<max;i++)
{
	safe += heights[i];
	shown[i+1] = false;
}

// Write in style sheets according to browser

if (document.getElementById || document.all) { // Explorer 4/5 and Netscape 5
	document.write("<STYLE TYPE='text/css'><!--");
	document.write(".para {display: none}");
	document.write("--></STYLE>");
}
else if (document.layers) { // Netscape 4
	document.write("<STYLE TYPE='text/css'><!--");
	document.write(".para {position: absolute; visibility: hide; top: " + safe + "}");
	document.write(".head {position: absolute; visibility: hide;}}");
	document.write("--></STYLE>");
}

// The blocking function

function blocking(nr) {
	if (document.getElementById) { // Netscape 5 and Explorer 5
		current = (document.getElementById(nr).style.display == 'block') ? 'none' : 'block';
		document.getElementById(nr).style.display = current;
	}
	else if (document.all) { // Explorer 4
		current = (document.all[nr].style.display == 'block') ? 'none' : 'block'
		document.all[nr].style.display = current;
	}

else if (document.layers) { // Netscape 4
	var i = parseInt(nr.substr(nr.length-1,1));
	var replacing = heights[i-1];
	if (shown[i]) {
		shown[i] = false;
		replacing = -replacing;
		document.layers[nr].visibility = 'hide';
		document.layers[nr].top = safe;
	}
	else {
		shown[i] = true;
		document.layers[nr].visibility = 'show';
		var tempname = 'header' + i;
		document.layers[nr].top = document.layers[tempname].top + headerheight;
	}
	for (j=(i+1);j<=max;j++) {
		name1 = 'header' + j;
		document.layers[name1].top += replacing;
		if (shown[j]) {
			name2 = 'number' + j;
			document.layers[name2].top += replacing;
		}
	}
}
else alert ('This link does not work in your browser.');
}