function setLeftNav(setBlockItem, setColorItem, setNoneItem) {
	if(!document.getElementById){
		return false;
	}
	else {
	document.getElementById(setBlockItem).style.display = 'block';
	document.getElementById(setColorItem).style.backgroundColor = '#5B5B9E';
	document.getElementById(setColorItem).style.backgroundImage = 'url("/images/bullett_nav_on.jpg")';
	document.getElementById(setColorItem).style.color = '#CCCC99';
	if(setNoneItem!=''){
		document.getElementById(setNoneItem).style.display='none';
	}
	}

}