/**
 * @author harm.wimmenhove@siyou.nl
 */

//set height
function roll() {
	document.getElementById('mainnav').style.height='365px';
}
function rollout() {
	document.getElementById('mainnav').style.height='128px';
}

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

//show
function show(object) {
	document.getElementById(object).style.display='block';
}
//hide
function hide(object) {
	document.getElementById(object).style.display='none';
}