function emailvalidation(entered, alertbox){
		apos = entered.indexOf("@");
		dotpos = entered.lastIndexOf(".");
		lastpos = entered.length-1;
		if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2){
			if(alertbox) alert(alertbox);
			return false;
		} else return true;
	}
	
	function digitvalidation(entered, minVal, maxVal, alertbox, datatype){
		checkvalue = parseFloat(entered);
		if(datatype){
			smalldatatype = datatype.toLowerCase();
			if(smalldatatype.charAt(0)=="i"){
				checkvalue = parseInt(entered);
				if(entered.indexOf(".")!=-1) checkvalue = checkvalue + 1;
			}
		}
		if((parseFloat(minVal)==minVal && entered.length<minVal) || (parseFloat(maxVal)==maxVal && entered.length>maxVal) || entered!=checkvalue){
			if(alertbox) alert(alertbox);
			return false;
		} else return true;
	}
	
	function lettervalidation(entered, minVal, maxVal, alertbox){
		if(entered.length>=minVal && entered.length<=maxVal){
			for(i=0;i<entered.length;i++){
				if(entered.charCodeAt(i)<65 || (entered.charCodeAt(i)>90 && entered.charCodeAt(i)<97) || entered.charCodeAt(i)>122){
					if(alertbox) alert(alertbox);
					return false;
				}
			}
			return true;
		} else {
			if(alertbox) alert(alertbox);
			return false;
		}
	}