function show_layer(layer_name)
{
document.getElementById("home_sub").style.display='none';	
document.getElementById("about_sub").style.display='none';	
document.getElementById("register_sub").style.display='none';	
document.getElementById("attend_sub").style.display='none';	
document.getElementById("Exhibitor_sub").style.display='none';
document.getElementById("sponsor_sub").style.display='none';	
document.getElementById("Travel_sub").style.display='none';	
document.getElementById("Press_sub").style.display='none';	
document.getElementById("faq_sub").style.display='none';	
document.getElementById("sponsor_sub").style.display='none';	

if(document.getElementById("home_sub_mm").src !='images/links-_01.jpg')
document.getElementById("home_sub_mm").src ='images/links-_01.jpg';
if(document.getElementById("about_sub_mm").src !='images/links-_02.jpg')
document.getElementById("about_sub_mm").src ='images/links-_02.jpg';
if(document.getElementById("register_sub_mm").src !='images/links-_03.jpg')
document.getElementById("register_sub_mm").src ='images/links-_03.jpg';	
if(document.getElementById("attend_sub_mm").src!='images/links-_04.jpg')
document.getElementById("attend_sub_mm").src ='images/links-_04.jpg';
if(document.getElementById("Exhibitor_sub_mm").src !='images/links-_05.jpg')
document.getElementById("Exhibitor_sub_mm").src ='images/links-_05.jpg';
if(document.getElementById("sponsor_sub_mm").src!='images/links-_06.jpg')
document.getElementById("sponsor_sub_mm").src ='images/links-_06.jpg';
if(document.getElementById("Travel_sub_mm").src!='images/links-_07.jpg')
document.getElementById("Travel_sub_mm").src ='images/links-_07.jpg';
if(document.getElementById("Press_sub_mm").src!='images/links-_08.jpg')
document.getElementById("Press_sub_mm").src ='images/links-_08.jpg';
if(document.getElementById("faq_sub_mm").src!='images/links-_09.jpg')
document.getElementById("faq_sub_mm").src ='images/links-_09.jpg';	

if(layer_name=="home_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_01.jpg';	
if(layer_name=="about_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_02.jpg';	
if(layer_name=="register_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_03.jpg';	
if(layer_name=="attend_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_04.jpg';	
if(layer_name=="Exhibitor_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_05.jpg';	
if(layer_name=="sponsor_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_06.jpg';	
if(layer_name=="Travel_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_07.jpg';	
if(layer_name=="Press_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_08.jpg';	
if(layer_name=="faq_sub")
document.getElementById(layer_name+'_mm').src='images/links-effects_02_09.jpg';	





document.getElementById(layer_name).style.display='block';	
}
 
function checkInput() {
	var inputStr = document.form1.search.value 
   	var strLen = parseInt(inputStr.length) 
   	if (strLen < 3) {
		
		alert ("\n\nYour search input must be \nat least 3 characters long!\n\n");
		return false;
	}
	if (inputStr == 'and') {
		
		alert ("\n\nTo search for the word AND you must put it in quotes.\n\n");
		return false;
	}
	if (inputStr == 'not') {
		
		alert ("\n\nTo search for the word NOT you must put it in quotes.\n\n");
		return false;
	}
	return true;
	}