var mainContent=document.getElementById('main_column'),rightCol=document.getElementById('right_column');
function imageChange(num){
mainContent.getElementsByTagName('h1')[0].className='hide';
mainContent.getElementsByTagName('p')[0].className='hide';
mainContent.innerHTML=mainContent.innerHTML+'<p id="image"><img src="images/image_home_large_'+num+'.jpg" alt="" /></p>'
}

function imageChangeBack(){
mainContent.getElementsByTagName('h1')[0].className='';
mainContent.getElementsByTagName('p')[0].className='';
mainContent.removeChild(document.getElementById('image'));
}