function chkEmail(str) {
	var invalidaddress=new Array()
	invalidaddress[0]="hotmail"
	invalidaddress[1]="yahoo"
	invalidaddress[2]="naharnet"
	invalidaddress[3]="abv.bg"
	invalidaddress[4]="thezonebg"
	invalidaddress[5]="uymail"
	invalidaddress[6]="indiainfo"
	invalidaddress[7]="gmail"	
	//extend or shorten this list if neccessary

	var invalidcountry=new Array()
	invalidcountry[0]="bg"
	//extend or shorten this list if neccessary

	var invalidcheck=0;
	var tempstring=str.split("@")
	tempstring=tempstring[1].split(".")
	tempname=tempstring[0]
	tempcountry=tempstring[1]
	
	for (i=0;i<invalidaddress.length;i++){
	if (tempname==invalidaddress[i])
	invalidcheck=1
	}
	
	for (i=0;i<invalidcountry.length;i++){
	if (tempcountry==invalidcountry[i])
	invalidcheck=1
	}

	
	var at="@";
	var dot=".";
	var lat=str.indexOf(at);
	var lstr=str.length;
	var ldot=str.indexOf(dot);
	var ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";
	for(var i=0; i<str.length ;i++){if(ok.indexOf(str.charAt(i))<0) return (false);}
	if (str.indexOf(at)==-1) return false
	else if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr) return false
	else if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr) return false
	else if (str.indexOf(at,(lat+1))!=-1) return false
	else if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot) return false
	else if (str.indexOf(dot,(lat+2))==-1) return false
	else if (str.indexOf(" ")!=-1) return false
	else if (invalidcheck!=0) return false 
	else return true;
}