function MM_menu(str,str1){
document.getElementById("productsnav").style.display='none';
document.getElementById("hitechnav").style.display='none';
document.getElementById("home").className='';
document.getElementById("about-us").className='';
document.getElementById("products").className='';
document.getElementById("hi-tech").className='';
document.getElementById("press-release").className='';
document.getElementById("demo").className='';
document.getElementById("contact-us").className='';
try{document.getElementById(str1).style.display='';}catch(e){};
try{document.getElementById(str).className='btnhover';}catch(e){};
}