function checkSubmit()	{
	if (document.forms[0].compname.value=='' || 
		document.forms[0].contname.value=='' || 
		document.forms[0].email.value=='' || 
		document.forms[0].telno.value=='')		{ 
		alert('Please complete all mandatory fields.' ); 
		return false;
	} else { 
		var emailaddress=document.forms[0].email.value;
		var emailFormat = /^\w(\.?[\w-])*@\w(\.?[\w-])*\.[a-zA-Z]{2,6}(\.[a-zA-Z]{2})?$/i;
		if (emailaddress.search(emailFormat) == -1)	{
			alert("Please specify your email address in the following format: email@emailaddress.com");
			return false; 
		}	else {
			if (navigator.appName =='Netscape') {
				document.getElementById('subbutton').disabled = true;
				document.getElementById('subbutton').style.width = '120px';
				document.getElementById('subbutton').value = 'Please wait...';
			} else {
				document.all.subbutton.disabled=true;
				document.all.subbutton.style.width='120px';
				document.all.subbutton.value='Please wait...';
			}
			return true; 
		}
	} 
}