/**
 * @author harm@siyou.nl
 */
function closeIntro(){
	document.getElementById('intro').style.display = 'none';
	document.getElementById('intro').style.zIndex = '0';
	document.getElementById('container').style.zIndex = '1000';
}

//field value change
function clearText(theField) {
    if (theField.defaultValue == theField.value)
    theField.value = '';
}
 
function addText(theField) {
	if (theField.value == '')
	theField.value = theField .defaultValue;
} 

function expand(object, btn){
	document.getElementById(object).style.height = 'auto';
	document.getElementById(btn).style.display = 'none';
}
function show(object) {
	document.getElementById(object).style.display = 'block';
}
function hide(object) {
	document.getElementById(object).style.display = 'none';
}
function getHeight(object) {
	var height = document.getElementById(object).offsetHeight;
	if(height > 257) {
		document.getElementById('expand').style.display = 'block';
	}
	else {
		document.getElementById('expand').style.display = 'none';
	}
}