if (document.images) {
            m1on = new Image();
            m1on.src = "images/m_enthone_on.gif";
			m2on = new Image();
            m2on.src = "images/m_cookson_on.gif";
			m3on = new Image();
            m3on.src = "images/m_alpha_on.gif"; 
            m4on = new Image();
            m4on.src = "images/m_speedline_on.gif"; 
	        m5on = new Image();
            m5on.src = "images/m_emailus_on.gif";
			m6on = new Image();
            m6on.src = "images/m_home_on.gif";
			m7on = new Image();
            m7on.src = "images/m_about_on.gif";
			m8on = new Image();
            m8on.src = "images/m_contacts_on.gif";
			m9on = new Image();
            m9on.src = "images/m_products_on.gif";
			m10on = new Image();
            m10on.src = "images/m_resources_on.gif";
			m11on = new Image();
            m11on.src = "images/m_employ_on.gif";
			m12on = new Image();
            m12on.src = "images/m_search_on.gif";
			m13on = new Image();
            m13on.src = "images/m_email_on.gif";
			m14on = new Image();
            m14on.src = "images/m_pwbchemistry_on.gif";
  
            m1off = new Image();
            m1off.src = "images/m_enthone.gif";
			m2off = new Image();
            m2off.src = "images/m_cookson.gif";
			m3off = new Image();
            m3off.src = "images/m_alpha.gif"; 
            m4off = new Image();
            m4off.src = "images/m_speedline.gif"; 
	        m5off = new Image();
            m5off.src = "images/m_emailus.gif";
			m6off = new Image();
            m6off.src = "images/m_home.gif";
			m7off = new Image();
            m7off.src = "images/m_about.gif";
			m8off = new Image();
            m8off.src = "images/m_contacts.gif";
			m9off = new Image();
            m9off.src = "images/m_products.gif";
			m10off = new Image();
            m10off.src = "images/m_resources.gif";
			m11off = new Image();
            m11off.src = "images/m_employ.gif";
			m12off = new Image();
            m12off.src = "images/m_search.gif";
			m13off = new Image();
            m13off.src = "images/m_email.gif";
			m14off = new Image();
            m14off.src = "images/m_pwbchemistry.gif";	
			
        }
function mOn(mName) {
        if (document.images) {
            document[mName].src = eval(mName + "on.src"); 
        }
}
function mOff(mName) {
        if (document.images) {
            document[mName].src = eval(mName + "off.src");
        }
}	

function preload(imgObj,imgSrc) 
{  if (document.images) 
   {  eval(imgObj+' = new Image()')
      eval(imgObj+'.src = "'+imgSrc+'"')
   }
}

preload('m1on','images/m_enthone_on.gif');
preload('m2on','images/m_cookson_on.gif');
preload('m3on','images/m_alpha_on.gif');
preload('m4on','images/m_speedline_on.gif'); 
preload('m5on','images/m_emailus_on.gif'); 
preload('m6on','images/m_home_on.gif');
preload('m7on','images/m_about_on.gif');
preload('m8on','images/m_contacts_on.gif');
preload('m9on','images/m_products_on.gif');
preload('m10on','images/m_resources_on.gif');
preload('m11on','images/m_employ_on.gif');
preload('m12on','images/m_search_on.gif');
preload('m13on','images/m_email_on.gif');
preload('m14on','images/m_pwbchemistry_on.gif');