function validaemail(form)
{
		var er_email = /^(.+\@.+\..+)$/
		var Band = 0
		if (trim(form.txtemail.value) != "")
		{
			if(!er_email.test(form.txtemail.value)) { 
				Band = 1;
			} 
		}	
		if (Band == 0)
		{			
			return(true);			
		}
		else
		{
			alert ("El e-mail ingresado no es válido.");
			form.txtemail.focus();
		}
}
function validaemail2(form)
{
		var er_email = /^(.+\@.+\..+)$/
		var Band = 0
		if (trim(form.txtemail2.value) != "")
		{
			if(!er_email.test(form.txtemail2.value)) { 
				Band = 1;
			} 
		}	
		if (Band == 0)
		{			
			return(true);			
		}
		else
		{
			alert ("El e-mail ingresado no es válido.");
			form.txtemail2.focus();
		}
}

function validaemail3(email)
{
		var er_email = /^(.+\@.+\..+)$/
		var Band = 0
		if (trim(email.value) != "")
		{
			if(!er_email.test(email.value)) { 
				Band = 1;
			} 
		}	
		if (Band == 0)
		{			
			return(true);			
		}
		else
		{
			alert ("El e-mail ingresado no es válido.");
			email.focus();
		}
}