var A = this.getField("A").value;   
var B = this.getField("B").value;  
var C = this.getField("C").value;  
var D = this.getField("D").value;  
 
if (A < 1)   
{   
 this.getField("E").value  = B*C;   
}  
else   
{   
this.getField("E").value = B*D;   
};   
 
this.getField("E").value;