/* JavaScript Document */
 var discnt = 0;   /* no default percent discount */

function IsValid(EntFld) 
	{
		var cde;
		cde = "MTP0905";
		if (EntFld == cde) 
		{
			return true;
    	} 
	else 
		{
     		return false; 
    	}
	}

function ChkCoup (coupval) 
	{      /* check user coupon entry */
		
		if (IsValid(coupval)) 
		{
      		discnt = 20;  /* remember the discount amt */
      		alert("discount code valid");
	  	} 
	  	else
		{	
      		discnt = 0;  /* remember the discount amt */
			alert("no discount");
    	}
  	}

function ReadForm (buyform) 
	{  /* apply the discount */
		var amt,des;
  		amt = buyform.baseamt.value*1.0;       /* base amount */
  		des = buyform.basedes.value;           /* base description */
  		if (discnt > 0) 
		{                   /* only if discount is active */
    		amt = Dollar(amt - (amt * discnt/100.0));
    		des = des +  " less 20% discount";
  		}
  		buyform.amount.value = Dollar(amt);
  		buyform.item_name.value = des;
	}
	
function Dollar (val) 
	{      /* force to valid dollar amount */
		var str,pos,rnd=0;
		if (val < 0.995) 
		{
	  		rnd = 1;
		} /* for old Netscape browsers */
	  	str = escape(val*1.0 + 0.005001 + rnd);  /* float, round, escape */
  		pos = str.indexOf(".");
  		if (pos > 0) 
		{
	  		str = str.substring(rnd, pos + 3);
  		}
  		return str;
	}