// JavaScript Document
function checkBlankField (txt)
			{
			var mint_txt = txt.length;
			var mstr_txt = txt;
			var mint_count = 0;
		    for (var iloop = 0; iloop<mint_txt; iloop++)
		    {
				        if (mstr_txt.charAt(iloop) == " ")
				        {
				           mint_count = mint_count+1;
				        }
				 }    
// if nothing entered in the field
   	 				if (txt == "")
   	 				{
					return false;
				    }
				    	 else if (mint_count == mint_txt)
				    	{
						return false;
						}
				return true;
				}
				

function valid_email(eml)
{
	//declare the required variables
	var mint_len;
	var mstr_eml=eml;
	var mint_at=0;
	var mint_atnum=0;
	var mint_dot=0;
	var mint_dotnum=0;

	mint_len = eml.length; //takes the length of the email address entered
	//checking for the symbol single quote. If found replace it with its html code
	if (mstr_eml.indexOf("'")!=-1)
	{	
		mstr_eml=mstr_eml.replace("'","'");
	}
	//checking for the (@) & (.) symbol
	for(var iloop=0;iloop<mint_len;iloop++)
	{
		if(mstr_eml.charAt(iloop)=="@")
		{
			mint_at=iloop+1;
			mint_atnum=mint_atnum+1;
		}
		if(mstr_eml.charAt(iloop)==".")
		{
			mint_dot=iloop+1;
			mint_dotnum=mint_dotnum+1;
		}
	}
	//if nothing entered in the field
	if (mstr_eml=="")
	{
		return true;
	}
	//if @ entered more than once & dot (.) entered more than 4 times
	else if((mint_atnum!=1)||(mint_dotnum>4)||((mint_dot-mint_at)<2)||((mint_len-mint_dot)<2)||(mint_at<3))
	{
		return true;
	}
	//if any blank space is entered in the email address
	else if (mstr_eml.indexOf(" ")!=-1)
	{
		return true;
	}
	return false;
}