function setContentSize() {
    var content = document.getElementById('mainContentBottom');
    var footerHeight = document.getElementById('footer').offsetHeight;
    var headerHeight = document.getElementById('header').offsetHeight;

    var webPage = content.offsetHeight + headerHeight + footerHeight + 151;

    var windowHeight = 0;

    if (window.innerHeight) {
       windowHeight = window.innerHeight;
    }
    else {
       windowHeight = document.documentElement.clientHeight;
    }

    if (webPage < windowHeight) {
       content.style.height = windowHeight - headerHeight - footerHeight + 'px';
    }
  }

function checkInputValue (el, val) {
    if (el.value == val) el.value = "";
    else if (el.value == "") el.value = val;
}

function checkFormValue (val) {
    if ( ftText.value == val ) {
        ftText.focus();
	return false;
    }
    return true;
}