function showEMailtxt()
{
	document.all("Proceed_lnk").style.visibility="hidden";
	document.all("pEMail_tr").style.display="";	
	cart.choetxt.focus()
	return false;
}

function HideEMailtxt()
{
	//document.all("Proceed_lnk").style.display="";
	document.all("Proceed_lnk").style.visibility="visible";
	document.all("pEMail_tr").style.display="none";	
	//cart.choetxt.focus()
	return false;
}

function chkEmailtxt()
{			
	ok=true
	if(cart.choetxt.value=="")
	{
		alert("Please enter e-mail address.")
		cart.choetxt.focus()
		ok=false
	}
	else
	{
		mail=cart.choetxt.value
		at_pos=mail.indexOf("@")
		dot_pos=mail.indexOf(".")
		if(at_pos<1 || dot_pos<1)
		{
			alert("Please check position of '@' and '.' in email address.")
			cart.choetxt.focus()
			ok=false
		}
		else
		{
			mail=cart.choetxt.value
			condition="yes"
			var at_count=0
			var dot_count=0
			var temp=0
			for(var i=0;i<mail.length;i++)
			{
				if((mail.charCodeAt(i)>0 && mail.charCodeAt(i)<48)||(mail.charCodeAt(i)>57 && mail.charCodeAt(i)<65)||(mail.charCodeAt(i)>91 && mail.charCodeAt(i)<97)||mail.charCodeAt(i)>122)
				{
					if(mail.charAt(i)=="@"||mail.charAt(i)==".")
					{
							if(mail.charAt(i)=="@"){at_count++}else{dot_count++} // counts the no. of times @ and . appears in email
							if(dot_count>=1)
							{
								dot_pos=i
								if((dot_pos>at_pos) && temp==0)
								{
									pos=dot_pos-at_pos
									temp++
								}								
							}
					}
					else
					{
						condition="no"
						i=mail.length
					}
				}
			}
			if(condition=="no")
			{
				alert("Your email contains a blank space or special character.")
				cart.choetxt.focus()
				ok=false
			}
			else
			{
				if(at_count>1)
				{
					alert("E-mail contains extra @ ")
					cart.choetxt.focus()
					ok=false
				}
				else
				{
					if(pos<2)
					{
						alert("Missing domain name between '@' and '.'")
						cart.choetxt.focus()
						ok=false
						i=mail.length
					}
					else
					{	
						count=dot_pos+1
						domain=""
						for(count;count<mail.length;count++)
						{
							domain=domain+mail.charAt(count)		
						}
						dom=new Array("au","com","net","org","edu","in","mil","gov","arpa","biz","aero","name","coop","info","pro","museum")
						error="yes"
						for(var k=0;k<dom.length;k++)
						{
							if(domain==dom[k])
							{
								k=dom.length
								error="no"
							}
						}
						if((error=="yes" && (domain.length>2)) || (domain.length<2))
						{
							alert("Domain name must end with well known domains \n or 2-lettered country name. eg com,edu,in etc.")
							cart.choetxt.focus()
							ok=false
						}								
					}
				}
			}
		}
	}
	return ok
}